Statistics Milestone 5 Exam / Questions with
Certified Solutions.
What is the chi-squared test statistic? Answers are rounded to the nearest
hundredth. - Answer: 3.36
Select the false statement about ANOVA. - Answer: If a researcher wants to
compare the mean wages of females in different age groups at a particular
company, he or she should not use an ANOVA because the population means are
unknown.
One condition for performing a hypothesis test is that the observations are
independent. Mary is going to take a sample from a population of 500 students.
Page 1 of 7
, How many students will Mary have to sample without replacement to treat the
observations as independent? - Answer: 50
The table below shows the results of a customer satisfaction survey at a particular
restaurant broken down by males and females.
MaleFemaleExtremely
Satisfied257Satisfied2113Neutral1316Dissatisfied914Extremely Dissatisfied25
Assuming all 5 choices are equally likely, select the observed and expected
frequency for male customers that are dissatisfied. - Answer: Observed: 9
Expected: 14
Rachel measured the lengths of a random sample of 100 screws. The mean length
was 2.9 inches, and the population standard deviation is 0.1 inch.
To see if the batch of screws has a significantly different mean length from 3
inches, what would the value of the z-test statistic be? - Answer: -10
A researcher has a table of data with 5 column variables and 5 row variables.
The value for the degrees of freedom in order to calculate the statistic is
__________. - Answer: 16
Adam tabulated the values for the average speed on each day of his road trip as
60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph.
If Adam wanted to construct a one-sample t-statistic, what would the value for the
degrees of freedom be? - Answer: 7
Page 2 of 7
Certified Solutions.
What is the chi-squared test statistic? Answers are rounded to the nearest
hundredth. - Answer: 3.36
Select the false statement about ANOVA. - Answer: If a researcher wants to
compare the mean wages of females in different age groups at a particular
company, he or she should not use an ANOVA because the population means are
unknown.
One condition for performing a hypothesis test is that the observations are
independent. Mary is going to take a sample from a population of 500 students.
Page 1 of 7
, How many students will Mary have to sample without replacement to treat the
observations as independent? - Answer: 50
The table below shows the results of a customer satisfaction survey at a particular
restaurant broken down by males and females.
MaleFemaleExtremely
Satisfied257Satisfied2113Neutral1316Dissatisfied914Extremely Dissatisfied25
Assuming all 5 choices are equally likely, select the observed and expected
frequency for male customers that are dissatisfied. - Answer: Observed: 9
Expected: 14
Rachel measured the lengths of a random sample of 100 screws. The mean length
was 2.9 inches, and the population standard deviation is 0.1 inch.
To see if the batch of screws has a significantly different mean length from 3
inches, what would the value of the z-test statistic be? - Answer: -10
A researcher has a table of data with 5 column variables and 5 row variables.
The value for the degrees of freedom in order to calculate the statistic is
__________. - Answer: 16
Adam tabulated the values for the average speed on each day of his road trip as
60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph.
If Adam wanted to construct a one-sample t-statistic, what would the value for the
degrees of freedom be? - Answer: 7
Page 2 of 7
