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The average number of mosquitos in a stagnant pond is 80 per square meter with a standard deviation of 12. If 25 square meters are chosen at random for a mosquito count, find the probability that the average of those counts is more than 81.4 mosquitos per square meter. Assume that the variable is normally distributed.
Find the value for the correlation coefficient r.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
What maximum variance of the raw score population could you have and still be able to reject the null hypothesis of μ = 20 (α = .05), if the sample size is 100 and the sample mean is 22?
A marketing analyst was studying the readability of two advertisements, each produced by a major company, and printed in the newspaper.
Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
Customers arrive to purchase tickets each hour. Determine the average time a ticket buyer must wait and the portion of time the ticket seller is busy.
Use a 0.05 significance level to test the claim that king-size cigarettes with filters have a lower mean amount of nicotine than the mean amount of nicotine in non-filtered king-size cigarettes.
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
Considering the sample method used, does the hypothesis test from Part (a) appear to be valid d) Given that the size of the sample is extremely large, can this sample size compensate for a poor method of sampling.
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
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