RES/351 RES 351 RES351 Week 5 Final Exam – New 2015 version, A guaranteed!
Question
What is the level of significance?
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Beta error
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Probability of a Type II error
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z-value of 1.96
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Probability of a Type I error
A null hypothesis makes a claim about a
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sample statistic
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sample mean
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Type II error
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population parameter
The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile?
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74
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75%
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111
·
37
A small sample of computer operators shows monthly incomes of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called?
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Class frequencies
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Class limits
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Raw data
·
Histogram
What level of measurement is the number of auto accidents reported in a given month?
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Nominal
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Ordinal
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Ratio
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Interval
If two events A and B are mutually exclusive, what does the special rule of addition state?
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P(A or B) = P(A) + P(B)
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P(A or B) = P(A) – P(B)
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P(A and/or B) = P(A) + P(B)
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P(A and B) = P(A) + P(B)
The performance of personal and business investments is measured as a percentage, return on investment. What type of variable is return on investment?
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Continuous
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Discrete
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Attribute
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Qualitative
What type of variable is the number of robberies reported in your city?
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Attribute
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Discrete
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Qualitative
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Continuous
The measurements of weight of 100 units of a product manufactured by two parallel processes have same mean but the standard of process A is 15 while that of B is 7. What can you conclude?
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Both processes are out of control.
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The weight of units in process A are grouped closer than in process B.
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More data is needed to draw a conclusion.
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The weight of units in process B are grouped closer than in process A.
A dot plot shows
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the interquartile range
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the general shape of a distribution
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the mean, median, and mode
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the relationship between two variables
The main purpose of descriptive statistics is to
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summarize data in a useful and informative manner
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gather or collect data
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determine if the data adequately represents the population
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make inferences about a population
Twenty randomly selected statistics students were given 15 multiple-choice questions and 15 open-ended questions, all on the same material. The professor was interested in determining on which type of questions the students scored higher. This experiment is an example of
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a paired t-test
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a test of proportions
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a one sample test of means
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a two sample test of means
The names of the positions in a corporation, such as chief operating officer or controller, are examples of what level of measurement?
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Nominal
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Ordinal
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Ratio
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Interval
Monthly commissions of first-year insurance brokers are $1,270, $1,310, $1,680, $1,380, $1,410, $1,570, $1,180, and $1,420. These figures are referred to as
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a histogram
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frequency polygon
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frequency distribution
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raw data
A sample of single persons receiving social security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839, and $965. How many observations are below the median?
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1
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0
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3
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2
For any data set, which measures of central location have only one value?
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Mode and mean
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Mean and median
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Mode and standard deviation
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Mode and median
The National Center for Health Statistics reported that of every 883 deaths in recent years, 24 resulted from an automobile accident, 182 from cancer, and 333 from heart disease. Using the relative frequency approach, what is the probability that a particular death is due to an automobile accident?
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182/883 or 0.206
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24/333 or 0.072
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24/883 or 0.027
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539/883 or 0.610
Shoe sizes, such as 7B, 10D, and 12EEE, are examples of what level of measurement?
·
Ratio
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Interval
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Nominal
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Ordinal
What is the variable used to predict the value of another called?
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Independent variable
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Variable of determination
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Dependent variable
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Correlation variable
The shape of any uniform probability distribution is
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bell shaped
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positively skewed
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negatively skewed
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rectangular
Suppose we test the difference between two proportions at the 0.05 level of significance. If the computed z is -1.07, what is our decision?
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Do not reject the null hypothesis.
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Reject the null hypothesis.
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Take a larger sample.
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Reserve judgment.
What is the chart called when the paired data (the dependent and independent variables) are plotted?
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Pie chart
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Scatter diagram
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Bar chart
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Histogram
The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
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inferential statistics
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descriptive statistics
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statistics
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levels of measurement
For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent of the observations?
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95%
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50%
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99.7%
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68%
For a hypothesis test comparing two population means, the combined degrees of freedom are 24. Which of the following statements about the two sample sizes is NOT true? Assume the population standard deviations are equal.
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Sample A = 12; sample B = 14
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Sample A = 10; sample B = 16
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Sample A = 13; sample B = 13
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Sample A = 11; sample B = 13
A listing of all possible outcomes of an experiment and their corresponding probability of occurrence is called a
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subjective probability
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frequency distribution
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random variable
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probability distribution
The sum of the deviations of each data value from this measure of central location will always be 0.
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Mean
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Median
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Standard deviation
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Mode
For a standard normal distribution, what is the probability that z is greater than 1.75?
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0.0459
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0.4599
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0.0401
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0.9599
Which of the following conditions must be met to conduct a test for the difference in two sample means?
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Populations must be normal.
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Data must be at least of interval scale.
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Data must be at least of interval scale and populations must be normal.
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Variances in the two populations must be equal.
The mean of any uniform probability distribution is
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(a + b)/2
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(b – a)/2
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n?
·
? x/ ?
