Statistical Analysis I Homework1 2024
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Statistical Analysis I
Homework1
January 26, 2024
Problem 1: Select the correct answer
(a)The average age of the employees in a marketing company is 35 years. This statement describe
❼ Inferential statistics.
❼ Descriptive statistics.
(b)From past figures, it is predicted that 50% of the registered voters will vote in the presidential election. This statement describe
❼ Inferential statistics.
❼ Descriptive statistics.
Problem 2
For the following data set:
8.2 8.5 7.7 7.0 7.6
9.2 4.9 9.3 8.7 6.9
8.8 2.9 7.0 1.5 8.5
8.5 6.5 9.6 8.0 8.2
1. Construct a stem and leaf diagram.
2. Construct a relative frequency histogram using 5 classes.
Problem 3
A data set has the following frequency distribution table:
The number p is unknown. Can you construct a frequency histogram? If so, construct it. If not, say why not.
Problem 4
For the following, identify the type of the data (quantitative discrete, quantitative continuous, or qualitative):
1. Number of tickets sold to a concert.
2. Favorite soccer team.
3. Time in line to buy movie tickets.
4. Age of retirement in 20 companies.
5. Number of students enrolled at JHU.
Problem 5
Identify each variable as continuous or discrete:
1. Weight of two dozen shrimp.
2. A person’s body temperature.
3. Number of people waiting for treatment at a hospital emergency room.
4. Number of properties for sale by a real estate agency.
5. Number of claims received by an insurance company during one day.
6. Length of time for a driver to respond when faced with an impending collision.
Problem 6
For each of the following identify: Population, sample, variable, data
1. A fitness center is interested in the mean a mount of time a client exercises in the center each week.
2. A dentist is interested in the mean recovery period of his patients who have had root canals.
3. A marketing agency is interested in the proportion of people who will buy a certain product.
2024-01-30