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The average daily jail population in the United States is 706,242. If the distribution is normal and the standard deviation is 52,145, find the probability that on a randomly selected day the jail population is:
a. Greater than 750,000
b. Between 600,000 and 700,000
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
Develop a spreadsheet model to determine the optimal number of magazines to order each day. Use 500 replications and round the demand values generated by the normal random number generator (RNG) to the closest integer value.
In the data collected for construction of c chart, the average number of defects per unit of output is c = 7.5. Discuss the 3-sigma upper and lower control limits for the control chart?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
The point estimate for the difference between the proportions is:
Developing the histogram and pie chart for the sample data.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
Find the difference between the actual Y value and predicted Y value for each individual, square the differences, and add the squared values to obtain SS residual.
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