Statistics - The decision to reject or fail to reject a null hypothesis is based on computing

Statistics - The decision to reject or fail to reject a null hypothesis is based on computing

Question # 00233039 Posted By: kimwood Updated on: 03/27/2016 10:43 PM Due on: 04/26/2016
Subject Business Topic General Business Tutorials:
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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
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    Tutorial # 00228255 Posted By: kimwood Posted on: 03/27/2016 10:43 PM
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