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Question: Manufacturing and Product Development The efficiency of an electric toothbrush is often judged by the rotation speed, in revolutions per minute (rpm). Two brands were selected for comparison, and independent random samples of each electric toothbrush were obtained. The rotation speed for each toothbrush was measured, and the summary statistics are given in the following table.
a. Is there any evidence to suggest that the Sonicare Elite has a greater population mean rotation speed than the Oral-B? Assume normality and use a = 0.05.
b. Find the p value associated with this hypothesis test.
Explain why we need measures of variability and what information these measures convey.
What proportion is that of the 400 members in town? What is the approximate probability that the actual proportion requiring aid will exceed that value?
At a food processing plant, a machine produces 10 lb bags of sugar. In this particular process, it is important that the sugar content does not go below 9.9 lbs. In fact, when the bags of sugar are less than 9.9 lbs, maintenance is performed on th..
Show that the condition ensuring a limiting distribution holds in this case. What is the limiting distribution? What can you say if there are four chairs rather than five?
A) What is the width of the 95% confidence interval for estimating the difference between the mean duration of symptoms in the two groups?
A sample of 20 assemblies was checked for bolt torque. The results from the 100 bolts had a mean of 47.2 Nm and a standard deviation of 1.38 Nm.
An article in Bloomberg Markets compares returns for the Hermitage Fund with those of the Russian Trading System Index.
question 1 the mean starting salary for college stats major graduates in spring of 2011 was 65000. assuming a normal
If the cafeteria uses 1.18 ounces of beef and 2.91 ounces of bread to make the new burger, the total cost of the new burger (excluding other ingredients) is ____ dollars, (Please round to two decimal points and include no units.) and the content o..
Are the following workers more likely to experience short-term or long-term unemployment? Explain.
one of the cards from an ordinary deck of 52 cards is lost. what is the probability that a random card drawn from this
If the dean wanted a 90% confidence interval of mean annual salary of graduates with width no more than $3,000, how large a sample of graduates would she need?
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