Math 1121 Quiz 1 Practice Name __________________
1. An insurance company wants to know the proportion of medical doctors in New York
involved in at least one malpractice suit in the last three years. They survey a random sample of
200 medical doctors in New York.
(a) What is the population?
(b) What is the sample?
(c) Could the insurance company generalize and say that this sample is representative of all
medical doctors in rural areas of the country? Why or why not?
2. At a used car lot the following information is obtained about one of the cars on the lot.
(a) Make and Model: Ford Escort
(b) Model year: 1990
(c) Color: blue
(d) Number of cylinders: 4
(e) Gas consumption: 35 miles per gallon
(f) Condition: Clean, in good repair
(g) Sticker price: $8,817.00
(h) Body registration number: TA1592763C51
(i) Number of miles on odometer: 36,719
(j) Sales Person Claim: This is the best car on the lot for you.
For the information (a) to (j) list the highest level of measurement that applies: ratio, interval,
ordinal, or nominal.
3. (a) Describe how you would use a random number table to get a random sample of 12 men’s
dress shirts taken from a shipment of 475 men’s dress shirts.
(b) Use the line from the random number table given below to identify the first five shirts in
your sample.
08811 82711 57392 25252 30333
4. The heights of ten varsity basketball players at Mountain View College were measured in
inches and found to be:
74 82 78 72 78 73 78 72 78 81
Find the mean, the median and the mode of the heights.
5. Some people are attracted to those who are like them. Others are attracted to those who are
quite different. In a study of this phenomenon a random sample of 32 people were surveyed to
determine their rating of attraction to people quite different from themselves. A scale from 1 to
20 was used. 20 represents feelings of greatest attraction. The results follow.
2 17 9 8 3 6 10 15 3 6 2
12 3 16 5 2 7 4 17 7 19 14
16 15 10 11 1 8 5 6 16 15
(a) Make a frequency table for this data using 5 classes. Show class limits, class boundaries,
frequencies and midpoints.
(b) Draw a histogram. Show the midpoints.
(c) Draw a frequency polygon.
