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To qualify for a special training, soldiers are tested for endurance. The scores are normally distributed with a mean of 165 and a standard deviation of 17. If only the top 20% of the soldiers are selected, what would the cutoff score be?
Team Marketing Report, a sports-business newsletter, estimates that the average total cost for a family of four to attend a major league baseball game is $132.
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us - chance variation." Is this a good defense? Justify your answer.
Using a significance level of 0.05 I want to conduct 3 hypothesis tests using the data below. I need to state my alternative and null hypotheses and test a claim about a proportion.
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
Standard deviation of 12%. Assume that scores in both classes follow a normal distribution. Convert Maria's midterm score of 84 to a standard z score.
Smaller the p-value in test of hypothesis, the more important the results are.
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
A new industrial oven has just been installed at the Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each half hour.
The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year.
All else being equal, what occurs to your confidence interval when you increase value of alpha?
Construct a 95% confidence interval for the proportion of votes that Jefferson will receive, and make a conclusion about Jefferson winning election.
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
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