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A sales manager is concerned about drop in sales in his store territory, between summer and the winter seasons. A sample of 40 stores was studied during summer and winter. During the summer months the mean sales was $1000 with standard deviation of $85. The mean sales during the winter months was $995 with a standard deviation of $100. At 0.02 significance level can we conclude there is a difference in sales between the two seasons? Find the p value
a. Construct a simple tabulation in which the counts are according to which company supplied the mechanical components. b. Construct a cross-tabulation describing the 100 compressors tested, using mechanical supplier and electrical/ moto..
A study of 35 golfers showed that their averages score on a particular course was 92. The standard deviation of the sample is 5.
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct.
on a multiple choice test of 13 questions each question has four 4 possible answers one of which is correct. for
Between 1951 and 2000, there were 295 hurricanes in the Atlantic Ocean. Assume thatthe numbers of hurricanes in different years can be accurately modeled
Production of the three machines one article is selected at random. if it found that this article is defective, what is the probability that it was manufactured by machine X?
Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
a student survey was done to study the relationship between where students live dormitory apartment house co-op or
The 587th of the 731 trees in the preserve was selected as the first observation in the sample. What is the tree number of the second observation in the sample?
Do these data provide evidence that metal-tagged penguins have a later mean arrival time?
A random sample of 36 customers is selected. What is the probability that the average time spent per customer is between 2.9 and 3.2 minutes?
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
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