Some of the same questions The decision to reject or fail to reject a null hypothesis is based on computing a ________ from sample data. (Points : 1)

population parameter critical value level of significance test statistic

Question 2.2.

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

Identify the p-value. (Points : 1)

0.1483 0.2966 0.8517 0.7034

Question 3.3.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 4.4.Hypothesis testing is a technique that allows you to draw statistically valid conclusions about ________. (Points : 1)

random errors sample statistics population parameters individuals

Question 5.5.The hypothesized sampling distribution of the test statistic is divided into ________ parts. (Points : 1)

four two six three

Question 6.6.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 7.7.Statistical inference is the process of drawing conclusions about ________ from sample data. (Points : 1)

surveys populations individuals sampling errors

Question 8.8.The alternative hypothesis is denoted by ________. (Points : 1)

HN H0 H1 HAl

Question 9.9.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 10.10.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 11.11.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 12.12.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 13.13.

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 14.14.A helpful analogy of hypothesis testing might be the concept of ________. (Points : 1)

the U.S. legal system-innocent until proven guilty better safe than sorry. the theory of relativity the central limit theorem

Question 15.15.Hypothesis testing involves drawing inferences about two contrasting ________ relating to the value of a population parameter. (Points : 1)

theorems data sets assumptions propositions

Question 16.16.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 17.17.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 18.18.Which of the following is the commonly used significance level for a, in most business applications? (Points : 1)

0.5 0.25 0.05 0.0005

Question 19.19.ANOVA allows us to compare the ________ of several different groups. (Points : 1)

variances means distributions proportions

Question 20.20.To determine if there was a statistically significant difference in the means of two independent groups, which statistical tool would one be most likely to employ to assess the significance of any observed difference? (Points : 1)

paired samples t-test chi-square test for independence Levene's test for homogeneity of variances independent samples t-test