Capella PSYC4700 Week 3 Quiz Latest 2023

PSYC4700 - Stat for Behavioral Sciences

Week 3 Quiz 1

Question 1

The size of a population is symbolized as ______, whereas the size of a sample is symbolized as ______.            

a. µ; M

b. M; µ

c. n; N

 d. N; n

Question 2

A researcher reports that "the average shopper in the sample (n = 12) purchased $65.00 worth of items (µ = $65.00) during a busy shopping day." What mistake was made in this citation?                                 

a. None; this citation is written appropriately.

 b. The sample mean is written using the wrong notation.

c. The sample size is written using the wrong notation.

d. Both the sample mean and the sample size are written using the wrong notation.

Question 3

Which type of mean is used to describe a portion of individuals in a given population?                                   

a. sample mean

b. population mean

c. restricted mean

d. none of these

Question 4

A researcher records the following data for the number of different food items chosen by seven participants in a buffet-style setting: 1, 6, 2, 5, 4, 3, and 7. Is the mean equal to the median in this example?                                       

a. Yes.

b. No; the median is larger than the mean.

c. No; the mean is larger than the median.

d. There is not enough information to answer this question.

Question 5

The ______ is the value that occurs most often or at the highest frequency in a distribution.     

a. mean

b. median

 c. mode

d. range

Question 6

A researcher records the hospital admission rates for coronary heart disease at 10 local hospitals. She finds that two different hospitals had the highest overall rates of hospital admissions. Which measure of central tendency did this researcher use to describe these data?                                

a. mean

b. median

 c. mode

d. range

Question 7

The median would be used to describe which of the following variables?                                             

a. gender

b. ethnicity

 c. rankings

d. brand name

Question 8

Which of the following is an example of a distribution with NO variability?                                           

a. scores: 3, 5, 4, 4, 5, and 3

b. scores: 5, 5, 5, 5, 5, and 5

c. scores: 1, 2, 3, 4, 5, and 6

d. None of these; all distributions have at least some variability greater than 0.

Question 9

Regardless of the number of scores in a distribution, the range only includes ______ score(s) in its calculation.                                 

a. one

 b. two

c. at most two

d. the average

Question 10

A researcher decides to split scores on an exam into quartiles. She determines that a score of 64 is at the 25th percentile, a score of 74 is at the 50th percentile, and a score of 80 is at the 75th percentile. What is the interquartile range (IQR) for these data?                                       

a. 16

b. 10

c. 6

d. There is not enough information to answer this question.                                      

Question 11

A reason for squaring deviations to compute SS in the numerator includes which of the following?          

a. The sum of the differences of scores from their mean is zero.

b. The sum of the squared differences of scores from their mean is minimal.

c. Squaring scores can be readily corrected by square rooting.

 d. All of these.

Question 12

Each deviation in the numerator for variance is squared because                                             

a. without squaring each deviation, the solution for SS would be zero.

b. this inflates the value for variance, making it more accurate.

c. without squaring each deviation, the solution could be negative.

d. without squaring each deviation, the solution for SS would be zero, and without squaring each deviation, the solution could be negative.

Question 13

How is the sample variance computed differently from the population variance?                                             

a. Only one formula includes a computation for SS.

b. The calculation in the numerator is different.

 c. The calculation in the denominator is different.

d. None of these; the sample variance and population variance are computed the same.

Question 14

A researcher records the number of classroom interruptions during each of two class sessions. Which session has the largest standard deviation?

Session A: 12, 15, 18, 24, and 30

Session B: 8, 10, 12, 16, and 20                                   

a. Sample A

b. Sample B

c. Both samples have the same standard deviation.

d. None of the above

Question 15

Which of the following is the best explanation for why the standard deviation is almost always reported with the mean?                                               

a. The standard deviation measures the spread of scores from the mean, so it is important to know both the mean and the standard deviation.

b. The standard deviation is also a measure of central tendency, so it is important to report this value ith the mean.

c. The mean and standard deviation estimate basically the same thing, so these values are typically reported together.

d. This is not true; the standard deviation is rarely reported with the mean.