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Construct a 95% confidence interval for the population mean given the following statistics: sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
Use RNG in Excel to generate n = 5 observations from the Normal distribution N(20, 5). Test H0: μ = 20 versus H0: μ ≠ 20 at the α = 0.05 level of significance. Repeat this process 100 times and then count the number of times that you reject H0.
If the population standard deviation is $7, and a random sample of 50 properties is chosen, what is the probability that the sample average will be below $35?
A researcher claims that the average age of people who buy theatre tickets is 51. A sample of 30 is selected and their ages are recorded as shown below.
John Kim is the purchasing manager for your computer, Inc., a manufacture of network servers. A truckload of sheet metal has just arrived. Previous experience with the supplier suggests that the thickness of the sheet metal follows a normal distri..
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
Read the data from the fictitious research study regarding diabetes and alcohol consumption, and analyze and interpret the results.
Using the original data, estimate the population standard deviation with 90% probability.
Find a research article and clearly define both the null and directional hypothesis that was or could have been tested during the statistical analysis of the data.
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Problems on Sampling Variability and Standard Error and Confidence Intervals
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
The shop wants a minimum of 60 man-years experience and wishes to maximize productivity. What machinists should they hire?
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