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The average or median quantity of groceries that every client buys in Churchill Grocery Store is $23.50. The population has a positive slant and the standard deviation is not known. Answer the following questions for a sample of 50 clients.
a) If the standard deviation of the sample is $5.00, which is the probability that the average or median of the samples is at least $25.00?
b) Once again, suppose that the standard deviation of the average or median is $5.00. Which is the probability that the average or median of the sample is greater than $22.50 but less than $25.00?
Estimate the values using multiple regression models. An air conditioning as well as heating repair firm conducted a study to determine if the outside temperature, Illustrate the forecasted monthly electric bill.
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
Find the confidence interval for the mean price, μ, of all dealer sticker prices of new cars: for a confidence level of 90% in thousands of dollars:
At the .01 significance level, is there a relationship between job pressure and age?
Compute z values for each and comment on your findings.
Basic Statistics problem
Find the sample size for the 95% confidence interval used to estimate the population proportion.
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
Explain a Type I error for this situation. Explain a Type II error for this situation.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Is there any evidence that the different teatments produced different responses? If so, which one seems to work best?
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