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The average hourly wage of workers at a car wash is $6.50/hr. Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this car wash is selected at random, what is the probability that the worker earns more than $6.75?
Standard deviation of 7. At 0.01 significance level, is there more variation in first population?
The US Mint selects ten pennies from the production line to test the hypothesis that the mean weight of each penny is 5 grams. The normally-distributed weights (in grams) of these pennies are as follows:
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
We say that two things have a positive relationship if they move in the same direction, or as one thing increases, so does the other. Or if one thing decreases, so does the other.
Suppose that it is a presidential election year and Ohio is one of the 'swing' states. Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
The Air Transport Association of America published figures on the busiest airports in the United States. The following frequency distribution has been constructed from these figures for the year 2000.
Describe what you find then produce an ANOVA for the problem.
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
A sales person at a company sold 6,903,435 of hardware equipment last year, a figure that represented the eighth decile of sales performance at the company. What can you conclude about the salesperson performance?
95% of breaking strengths will be contained between what two values symmetrically distributed around mean?
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
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