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Q 2 A rental car company promotes cheap, affordable, old cars to backpackers. The company is interested in estimating the average number of days its cars have been rented for over past few years. The company has the records for all its cars, but to use this data would be very expensive. To make a quick estimate, a random sample of 32 hire cars is selected from the company records. The number of days each car was hired is given below (in days).
2
3
7
5
8
1
9
6
10
4
11
Using these data, construct a 95% confidence interval to estimate the average number of days a car is rented out. Assume that the number of days a car is rented is normally distributed in the population. What can you conclude from your calculations?
The appropriate use of multiple regression depends on being able to make four basic assumptions about the data being used to develop the regression model:
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
Perform a regression analysis using compa as the dependent variable and the same independent variables as used in question 2. Show the result, and interpret your findings by answering the same questions.
the state criminology lab must sometimes estimate a persons height from partial skeleton remains. a random sample of
One state lottery has 1000 prizes of $1, 200 prizes of $5, 50 prizes of $25, 15 prizes of $150, 4 prizes of $500, and 1 prize of $2500. What is the lottery expected profit per ticket?
once upon a time there were two railway trains competing for the passenger traffic of 1000 people leaving from chicago
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
a researcher wants to determine a 95 confidence interval for the mean number of hours that umkc students spend doing
Populate the selected graph/frequency chart with fictitious data. Did your selected graph/frequency chart effectively portray the data?
Mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.
Do the data indicate that the distribution of preferences for older adults is significantly different from the distribution for college students? Test with .05.
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