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Question 1
The alternate hypothesis
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is accepted if the null hypothesis is rejected |
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Will always contain the equal sign |
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Tells the value of the sample mean |
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None of the above |
Question 2
“If the null hypothesis is mean (mu) equal to or greater than 200 and the alternate hypothesis states that mean (mu) is less than 200, then, a two-tail test is being conducted”
True False
Question 3
“Three new colors have been proposed for the Jeep Grand Cherokee vehicle. They are silvered-blue, almond, and willow green. The null hypothesis for a goodness-of-fit test would be”
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will green is preferred over the other colors. |
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that there is no preference between the colors. |
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Any one color is preferred over the other colors. |
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impossible to determine.
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Question 4
Suppose you compare the mean of raw data and the mean of the same raw data grouped into a frequency distribution. These two means will be
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Exactly equal |
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the same as the median |
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The same as the geometric mean |
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Approximately equal
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Question 5
We wish to estimate the population proportion. We want to be 95 percent confident of our results and we want the estimate to be within
0.01
of the population parameter. No estimate of the population proportion is available. What value should we use for p?
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1.96 |
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0.5 |
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“We cannot complete the problem, we need more information” |
Question 6
“If a confidence interval for the difference between a pair of treatment means includes 0, then there is no difference in the pair of treatment means.”
True False
Question 7
In correlation analysis
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we consider several independent variable |
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we study the strength of the association between two variables |
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we consider the intercept with the y-axis |
Question 8
The chi-square goodness-of-fit test can be applied if there are equal or unequal expected frequencies.
True False
Question 9
Suppose we select 6 observations from each of three treatments. The appropriate degrees of freedom for the F distribution are
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3 and 6 |
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2 and 6 |
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2 and 15 |
Question 10
Under which of the following conditions will the computed value of F be negative?
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When there is no difference in the treatment means |
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When there is no difference in the block means |
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When the SS total is larger than SST |
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F cannot be negative |
Question 11
A Type I error is
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the correct decision |
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a value determined from the test statistic |
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rejecting the null hypothesis when it is true |
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accepting the null hypothesis when it is false. |
Question 12
“Suppose the least squares regression equation is Y = 1202 + 1,133X. When X = 3, what does Y equal?”
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“5,734” |
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“8,000” |
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“4,601” |
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“4,050” |
Question 13
Which of the following are correct statements regarding the goodness-of-fit test?
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Data may be of nominal scale. |
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Population must be normal. |
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All the expected frequencies must be equal. |
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All of the above |
Question 14
The level of significance
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is frequently 0.05 or 0.01 |
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can be any value between 0 and 1 |
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is the likelihood of rejecting the null hypothesis when it is true. |
Question 15
“A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa and Discover. Six MasterCard sales, seven Visa; and five Discover sales were recorded. The store used ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?”
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“18 in the numerator, 3 in the denominator” |
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“3 in the numerator, 18 in the denominator” |
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“2 in the numerator, 15 in the denominator” |
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“6 in the numerator, 15 in the denominator” |
Question 16
A t test is used to test the significance of the coefficient of correlation.
True False
Question 17
“For a one-tailed test using the 0.05 level of significance, the critical value for the z test is 1.645, but for the 5 it is 1.96”
True False
Question 18
“The term “”Treatment”” refers to”
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a source of variation |
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the numerator degrees of freedom |
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the variation within the cells |
Question 19
“Trying to predict weekly sales with a standard error of estimate of $1,955, we would conclude that 68 percent of the predictions would not be off more than $1,955, 95 percent would not be off by more than $3,910, and 99.7 percent would not be off by more than $5,865.”
True False
Question 20
In a contingency table
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the number of rows must be the same as the number of columns |
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a variable is classified according to two criteria. |
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there must be at least 10 observations in each cell |
