Question 1.1.In general, whenever p-value is less than a, ________. (Points : 1)

we reject the null hypothesis we choose a different level of significance we fail to reject the null hypothesis the hypothesis test is inconclusive

Question 2.2.Statistical inference is the process of drawing conclusions about ________ from sample data. (Points : 1)

surveys populations individuals sampling errors

Question 3.3.ANOVA allows us to compare the ________ of several different groups. (Points : 1)

variances means distributions proportions

Question 4.4.The null hypothesis ________. (Points : 1)

describes an existing theory or belief that is accepted as correct in the presence of contradictory data describes an existing theory or belief that is accepted as correct in the absence of contradictory data is based on new information provided by sample data is based on new information provided by population data

Question 5.5.Two-tailed tests ________. (Points : 1)

have only lower critical values have only upper critical values have both upper and lower critical values do not have any critical values

Question 6.6.

Use the below information to answer the question.

A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees.

	Females	Males
Number of managers	18	23
Sample size	45	75

Compute the 99% confidence interval estimate of the difference between the two proportions. [Hint: Use PHStat] (Points : 1)

(0.139, -0.326) (0.084, -0.270) (-0.084, 0.270) (-0.139, 0.326)

Question 7.7.

Use the information below to answer the question.

The following table provides data on a sample of customers who visited a local restaurant. The restaurant owner believes that the average profit per customer exceeds $25.

36.73	35.50
25.92	38.36
41.65	25.50
18.78	19.78
33.14	22.22
20.85	26.23
22.13	32.33
28.46	34.15
34.72	24.21
24.20	28.95
21.84	19.74
20.75

Which of the following is the critical value using a level of significance of 0.05? (Points : 1)

1.717 -1.717 1.7139 -2.0739

Question 8.8.The power of the test has a value of ________. (Points : 1)

1 - a 1 + 1 - a -

Question 9.9.An online retailer wanted to see if purchasing patterns were different between male consumers and female consumers. Males were found to have spent a mean of $85 per month on online purchases, whereas females were found to have spent a mean of $78 per month. An independent samples t-test was conducted to assess the observed difference between the two groups of consumers. A two-tailed test was applied. The value of the t-Test Statistic for the observed differences was -4.7, where the p-value is less than 0.0002. What conclusion can be made about the observed difference? (Points : 1)

There is a statistically significant difference between the two groups of consumers. There is statistically no significant difference between the two groups of consumers. The independent samples t-test is not the appropriate hypothesis-testing procedure. There is not sufficient information to conclude.

Question 10.10.The t-Test Statistic has a t distribution with ________ degrees of freedom. (Points : 1)

n n + 1 n - 2 n - 1

Question 11.11.The confidence coefficient is ________. (Points : 1)

the probability of correctly failing to reject the null hypothesis the probability of making a Type II error the probability of making a Type I error the probability of correctly rejecting the null hypothesis

Question 12.12.If the null hypothesis is false, it is more likely that the test statistic will ________. (Points : 1)

fall into the nonrejection region not follow the uniform distribution fall into the rejection region not follow the normal distribution

Question 13.13.Another term for p-value is ________. (Points : 1)

degrees of freedom random effect probability density function observed significance level

Question 14.14.Increasing the sample size is one way to ________. (Points : 1)

reduce reduce the power of the test increase the standard error of the mean determine the exact value

Question 15.15.A one-tailed test is employed when the null hypothesis ________. (Points : 1)

is structured as "" specifies a direction of relationship is structured as "=" falls in the upper tail of the distribution

Question 16.16.The rejection region is defined by ________. (Points : 1)

a critical value the power of the test the probability of a Type II error the sample size

Question 17.17.If the confidence coefficient is 0.9, ________. (Points : 1)

we expect that 9 samples out of 100 will support the null hypothesis we expect that 90 out of 100 samples will support the null hypothesis we expect that 10 samples out of 100 will support the null hypothesis we expect that all 100 samples will support the null hypothesis

Question 18.18.The power of the test represents the ________. (Points : 1)

probability of correctly failing to reject the null hypothesis when it is indeed true probability of incorrectly rejecting the null hypothesis when it is actually true probability of incorrectly failing to reject the null hypothesis when it is actually false probability of correctly rejecting the null hypothesis when it is indeed false

Question 19.19.When conducting two-sample tests for means with independent samples, ________. (Points : 1)

it is always assumed that the population variances are equal the test for equality of variances is conducted, and if the variances are not equal the t-test in Excel should not be used the test for equality of variances is conducted to determine if the variances are equal and thereby choose the appropriate t-test in Excel it is always assumed that the population variances are unequal

Question 20.20.In statistical terminology, educational level is an example of a ________. (Points : 1)

continuous variable residual factor dependent variable