Below are the MCQs, you need to select the right answer and rectify the errors:

Most advertisements on television are priced based on the popularity of the shows during which they air. Which inferential tool best describes this rating system?

a. Hypothesis testing

b. Estimation

c. Descriptive statistics

d. Histogram

(*Answer): c. Descriptive statistics

2. Mail questionnaires are a useful tool for statisticians. Which of the following statements about mail questionnaires is false?

a. They can include both open- and closed-ended questions.

b. One of the drawbacks is that it is not easy to offer help to respondents.

c. The way the survey looks is an important aspect of its design.

d. These typically have a high response rate between 75 percent and 80 percent.

(Answer): d. These typically have a response rate between 75 percent and 80 percent

3. Janet Thompson is the general manager of the Quik-Rise Bakery. She is going over her employees’ time cards so she can complete their paychecks. She needs to know the total number of regular hours and overtime hours that each baker worked. What kind of data does she need?

a. Qualitative

b. Cluster

c. Quantitative

d. Time-series

(Answer): c. Quantitative

4. At Luck of the Draw restaurant, the first 100 customers to arrive for dinner earn the chance to roll a single die before they order. Based on the number they roll, they receive a different discount on their meals. If someone rolls a six, the meal is free. If someone rolls a one, there is no discount. The first 100 customers roll in random order. You are using classical probability assessment to determine the likelihood that customers will roll the different discounts. You have already determined that the elementary events are equally likely and the total number of elementary events. What is the next thing you need to do to determine the probability?

a. Define the event of interest.

b. Use a pair of loaded dice to keep the discounts low.

c. Complete the classical probability equation.

d. Determine the number of elementary events that are associated with the event of interest.

(Answer): a. Define the event of interest

5. The sales director at Halpern’s Department Store tracks the sales volume of certain types of items. She has determined the probability of a customer buying these items as follows in the table below:

Product________________Probability

Clothing…………………………0.14

Housewares……………………..0.12

Lawn & Garden…………………0.08

Other…………………………….0.44

Nothing….....................................0.22

She wants to know the probability that a customer will buy something. Utilize the complement rule, and choose the probability that her customers will buy something in the store.

a. 0.78

b. 0.41

c. 0.30

d. 0.70

6. Dan has a spreadsheet showing the results of the survey that he recently conducted about a new Web site design. He is trying to determine the standard deviation of the data set. What does the standard deviation measure?

a. The extent to which two discrete random variables are jointly related

b. A perfect linear relationship

c. The expected value of the sum of two random variables

d. The spread, or dispersion, in a set of data

(Answer): d. The spread, or dispersion, in a set of data

7. Exotic Stone, Inc., sells high-quality stone flooring, slabs and counter tops. The most expensive flooring is made from rosa aurora marble. Due to its expense, the company only keeps a small quantity in stock. The quality assurance manager is examining the population of rosa aurora marble tiles. The mean tile thickness of the population of rosa aurora marble tiles is 2.02 cm. This is an example of a(n) _____.

a. accelerated value

b. parameter

c. correlation coefficient

d. conditional probability

(Answer): b. parameter

8. You are reviewing the latest survey results from the Dairy Farmers of America account. You are responsible for analyzing the results. One of your tasks is to find the standard deviation and z -value of the sampling distribution. The sample size for the survey was large relative to the population size. You see that the sampling took place without replacement. What do you need to use when you are finding the z -value for this data set?

a. The Central Limit Theorem

b. An unbiased estimator

c. Theorem 6-1

d. The Finite Population Correction Factor

(Answer): d. The Finite Population Correction Factor

9. You are not sure if the sample of metal rods you’ve taken is normally distributed. You know, however, that if a sample is “sufficiently large” the Central Limit Theorem will apply. What is a conservative definition of a sufficiently large sample size?

a. n ? 3000

b. n ? 300

c. n ? 30

d. n ? 3

(Answer): c. n ? 30

10. When manufacturing #17 machine screws, it is important that the difference between a sample screw diameter and its parameter diameter is less than 0.0018 cm. This difference is called the _____.

a. covariance

b. sampling error

c. point estimate

d. summary change

(Answer): b. sampling error

Answer rating: 100% (QA)

1 Most advertisements on television are priced based on the popularity of the shows during which they air Which inferential tool best describes this rating system a Hypothesis testing b Estimation c D... View the full answer