MAT 133 1-4 Homework: Chapters 1 and 2
1. When Pennsylvania repealed a law that required motorcycle riders to wear helmets, a news headline reported. “Death soar After Repeal of Helmet Law.” After reading the story, Bill said, “But it’s just a correlation, not Causation.” Do you agree with Bill’s conclusion
a. Yes
2. Under a recent U.S Food and Drug Administration (FDA) standard for food contamination, 3.5 ounces of tomato sauce can have up to. 30 fly eggs and 11 ounces of wheat flour can contain 40 insect fragments. How could statistical sampling be used to see that these standards of food hygiene are being met by producers?
a. Sampling allows the FDA to stay, whether a margin of error and some levels of confidence, like tomato sauce products In the United States is meaning the standard.
3. There are 327 ofÏcial ports of entry in the United States. The Department of Homeland Security selected 15 points of entry at random to be audited for compliance with screening procedures of incoming travelers through the primary and secondary vehicle. And pedestrian lanes. What kind of sample is this?
a. Simple random sample.
4. The targeted population is all stocked in the S&P 500 index. Is each of the following a parameter or a statistic?
a. The average price/earnings ratio for all 500 stocks in the S&P index. > parameter
b. The proportion of all stocks in the S&P index that had negative earnings last year. > parameter
c. The proportion of energy related stocks in a random sample of 50 stocks. > statistic
d. The average rate of return for 20 stocks recommended by a broker. > statistic
5. Which measurement (nominal, ordinal, interval, ratio) level is each of the following variables?
a. Numbers of employee in the Walmart store in Hutchinson, Kansas. > ratio
b. Number of merchandises returned on a random chosen Monday at a Walmart store. > ratio
c. Temperature (in Fahrenheit.) in the ice cream freezer at a Walmart store. > interval
d. Name of the cashier at register 3 in a Walmart store. > Nominal
e. Managers rating of the cashier are registered three in a Walmart store. > ordinal
f. Social Security number of the cashier at Register three in a Walmart store. > nominal
6. Which type of data (cross-sectional or time series) is each
Note: Full answer to this question is available after purchase.
a. Scores of 50 students on a midterm accounting exam last semester. > cross-sectional
b. Bob score on 10 weekly accounting quizzes last semester. > time series
c. Average score by all takers of the state’s CPA exam for each of the last 10 years. > time series
d. Number of years of accounting work experience for each of the 15 partners in a CPA firm. > cross-sectional
7. What type of data (categorical, discrete numerical, continuous numerical) is each of the following variables?
a. The manufacturer of your car. > categorical
b. Your college major. > continuous numerical
c. The number of college credits you are taking. > discrete numerical
8. A. Which of these two displays (Table or graph) is more helpful in visualizing the relationship between restaurant size and interior seating for 74 noodles restaurants?
a. The graph is much more useful.
b. Describe the data. (The data points on the far-right show restaurants that have large square feet as well as a lot of interior seats. The point all the ways to the left show the opposite smaller square feet with hardly any interior seats.)
9. A. Which of these two displays (table or graph) is it more helpful in describing the solid sales by Noodles and Company?
a. Graph.
b. Select one sentence summary of the data. (The month of May saw most salads sold, while the month of December sold the least salads sold.)
10. Below are five questions from a survey of MBA students. For each question, state the data type (categorical, discrete numerical, or continuous numerical) measurement levels (nominal, ordinal, interval, ratio).
a. What is your gender? (male= 0, female = 1) > categorical, nominal
b. What is your approximate undergraduate college GPA? (1.0 to 4.0) > continuous numerical, ratio
c. About how many hours per week do you expect to work at an outside job this semester? > continuous numerical, ratio
d. What do you think is the ideal number of children for a married couple? > discrete numerical ratio? Discrete numerical, ratio
e. On a one to five scale, which best describes your parents? 1= mother clearly dominate, 5= father clearly dominate. > ordinal, categorical
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