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A simple random sample of 50 items from a population with σ 6 resulted in a sample mean of 32.
a. Provide a 90% confidence interval for the population mean.
b. Provide a 95% confidence interval for the population mean.
c. Provide a 99% confidence interval for the population mean
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
Perform a hypothesis test by using.04 level of significance to find out if there is a difference between the population means.
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height. They have collected data on gender, shoe size, and height
Prepare a 95% confidence interval for the average grocery bill. Would a 99% confidence interval be narrower or wider than the 95% confidence interval?
Follow the conventions as described in the general guidelines for writing up Special Problems.
Suppose that it is important to demonstrate that the wall thickness exceeds 4.0 mm. Test appropriate hypotheses using these data. Draw conclusions at α= 0.05.
Based on a study of heights of men and women who do gymnastics, a researcher concludes that the exercise from playing gymnastics causes people to become shorter. Do you agree with this conclusion?
Mr.Smith works on a temporary basis. The mean length of each job he gets is three months. If the amount of time he spends between jobs is exponentially distributed with distributed with mean 2, then at what rate does Mr. Smith get new job?
Describe the use of normal probability plot to evaluate whether a set of data is normally distributed?
A manufacturer of executive jet aircraft is concerned with its profit picture over the short run. It produces two different models of planes, x1 and x2. Its profits are $30,000 for each x1 and $20,000 for each x2. There are two major constraints o..
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
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