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A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $77.00.
a. Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals).
For each of the following hypotheses, decide whether a one-tailed or two-tailed test would be performed: Children with birth defects will score differently than the normal population on a measure of self-esteem.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
At a college, 70 percent of the students are women and 35 percent of students receive grade of C. About 20 percent of students are neither female nor C students. Use this contingency table.
64% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball fan.
Suppose you have drawn a simple random sample of 400 business executives. In this sample, 150 executives owned Blackberries.
If there is a difference between the two groups of scores. Briefly explain how the difference may have been caused by the treatments.
The null hypotheseis it true? Sketch the density curve of the sampling distribution. Be sure to locate mean and standard deviationn correctly.
Compute the approximate jp-value associated with the test statistic. Does the sample data support the null hypothesis at the a- 0.05 level?
Three coins are tossed simultaneously, consider the event E "Three heads or three tails" F " At least two heads" and G "Atmost two heads " of the pairs (E,F), (E,G) and (F,G), which are independent? Which are dependent?
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
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