Question 1

What occurs in inferential statistics?

Accepted Answer

A)  Inferring from a sample to a population 
B)  Testing statistical significance 
C)  Neither A nor B 
D)  Both A and B D

Question 2

Which hypothesis is used to make a statistical decision about the relationship between variables?

Accepted Answer

A)  Research 
B)  Alternative 
C)  Null C

Question 3

Which hypothesis is LEAST like the others?

Accepted Answer

A)  Research 
B)  Alternative 
C)  Null C

Question 4

When is the mean of a sampling distribution equal to the population parameter being measured?

Accepted Answer

A)  When the sample size is 30 or larger 
B)  When the statistic sampled is normally distributed 
C)  When an unbiased statistic is used 
D)  When the samples drawn are independent

Question 5

Which of the following situations, if either, illustrate(s) a proper simple random selection process?
(1) A sample is obtained by selecting 10 male and 10 female students from a student organization to represent the student population.
(2) A sample is obtained by assigning every athlete on campus a unique number and using a lottery to select 20 athletes to represent the student population.

Accepted Answer

A)  #1 only 
B)  #2 only 
C)  Both #1 and #2 
D)  Neither #1 or #2

Question 6

What is the value of the standard error of the mean if the test scores from a population of 25 students have a mean of 50 and a standard deviation of 15?

Accepted Answer

A)  2.0 
B)  3.0 
C)  3.06 
D)  3.27

Question 7

What is the standard error of the sampling distribution of the statistic G?

Accepted Answer

A)  The mean of repeated samples of statistic G 
B)  The number of samples drawn on statistic G 
C)  The size of the sample drawn to estimate the statistic G 
D)  The standard deviation of the distribution of repeated estimates of G

Question 8

Which method of sampling is random?

Accepted Answer

A)  When a large number of subjects are selected 
B)  When the possible number of subjects is infinite 
C)  When every member of the population has an equal chance of being selected 
D)  When every member of the population is selected

Question 9

How can the size of the confidence interval containing the mean be made smaller?

Accepted Answer

A)  Use a 99% percent confidence level rather than a 95% percent. 
B)  Increase the value of the standard error. 
C)  Decrease the sample size. 
D)  Decrease the variance by redefining the population to a narrower population.

Question 10

If the standard error of the mean is 4.0 and the sample mean is 37, what is the 95% confidence level containing the population mean (to the nearest tenth)?

Accepted Answer

A)  29.0-45.0 
B)  29.2-44.8 
C)  33.0-41.0 
D)  33.2-41.8

Question 11

The width of a confidence interval around a sample mean depends on which of the following?

Accepted Answer

A)  The sample size 
B)  The population variance 
C)  The level of confidence 
D)  All of the above

Question 12

In a study of four types of mouthpieces used by high school football players, it was found that all four were equal in terms of protection. The study also revealed that 92% of the football players from 12 of the 400 high schools in the state reported that there was no discomfort from wearing the mouthpieces. What type of statistic is 92%?

Accepted Answer

A)  An estimate computed from sample data 
B)  A parameter computed from sample data 
C)  An estimate computed from population data 
D)  A parameter computed from population data

Question 13

Which of the following is the difference between a parameter and a statistic?

Accepted Answer

A)  Alpha error 
B)  Sampling error 
C)  Standard error 
D)  Beta error

Question 14

Typically, which hypothesis suggests a difference between groups and which hypothesis suggests no difference between groups, respectively?

Accepted Answer

A)  Research; Null 
B)  Alternate; Research 
C)  Null; Research 
D)  Null; Alternate

Question 15

The standard error of the mean calculated from a sample of 16 subjects is 5. What is the standard deviation of the sample?

Accepted Answer

A)  3.2 
B)  4.0 
C)  20.0 
D)  80.0

Question 16

Which change results in reducing the value of the standard error of the mean?

Accepted Answer

A)  Increasing the range 
B)  Decreasing the size of the sample 
C)  Increasing the sample standard deviation 
D)  Increasing the size of the sample

Exam 6: Introduction to Inferential Statistics