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Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean of 75,000 miles and a standard deviation of σ miles. These tires come with a 60,000-mile warranty. The manufacturer of the tires can adjust σ during the production process, but the adjustment of is quite costly. The manufacturer wants to set σ once and for all so that only 1% of the tires will fail before warranty expires. Find the standard deviation to be set. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
if mouse weights are normally distributed with a mean weight of 23 and SD of 4. With 10 mice per box, what weight should they use so that no more than 8% of the boxes will have an average mouse weight below that weight?
Select two variables that might be related, such as the number of hours a student watches TV and the number of credits the student has, or a baseball player's salary and the number of home runs per year the player scores. You will need to get..
Suppose Ana has a pair of dice (the traditional six-sided kind). Let X= the difference of the largest minus the smallest number showing on the dice. Find the PMF for X.
Festival Histogram: Beginning with in the text on spotting outliers, correct the type in the data as directed - create a separate histogram for each day, Day1, Day2, and Day3, using the hygiene variable for all three days. Include the normal curve
Build a regression model
Explain what each of the metrics in the summary statistics means and what are they telling you about this data set? Is it symmetrical, flat, skewed, does it have outliers, and so on
Refer to "The Use of Electro-Acupuncture in Conjunction with Exercise for the Treatment of Chronic Low-Back Pain" by Yeung, Leung, and Chow. Examine the question the researchers were trying to answer and write an essay (500-750 words) that explains w..
(1 point) According to data from the Tobacco Institute Testing Laboratory, a certain brand of cigarette contains an average of 1.4 milligrams of nicotine. An advocacy group questions this figure, and commissions an independent test to see if the the ..
Which of the following statements about the correlation coefficient between variable X1 (Number of advertisements placed the previous week) and variable X2 (Number of calls received the previous week) is correct:
Do the independent variables correlate statistically significantly and practicallywith the dependent variable and is collinearity between the independent variables a concern?
How to calculate the sample size? i want to know the needs and wants of the people who buy some products in the asian supermarkets in the netherlands, so i decide to make interview with them , but firstly i need to calculate how many people s..
1. listed below are the numbers of people executed in the united states from 1976 nbsp to 1994. in 1976 the u.s.
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