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A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per litre with a standard deviation of 2.3 kilometers per litre.
A. Assuming that the kilometers per litre given by all mid-sized cars have a normal distribution, find a 99% confidence interval for the population mean μ.
B. Suppose the confidence interval obtained in (a) is too wide. How can the width of this interval be reduced? Describe all possible alternatives. Which alternative is the best and why?
The horizontal 30-N force acts on the handle of the wrench. Determine the moment of this force about point O. Specify the coordinate direction angles , , of the moment axis.
Suppose you want to estimate the sample size for a multiple correlation analysis. There are five predictors in your study.
a. Find the probability distribution of d1 and display it in a table. b. What is the expected value of d1? c. What is the value of the standard deviation of d1?
assume that iq scores are normally distributed with a standard deviation of 11 points and a mean of 100 points. if 140
The faculty members at Boise State University were surveyed on the question "How satisfied were you with the Summer 2002 Schedule?" Their responses were to be categorized as "very satisfied," "somewhat satisfied," "neither satisfied nor dissatisfi..
Provide a quantitative analysis that compares remeasurement 1 and 2 data to the baseline data:
Since they will be multiplying this average by the total number of customers to get an overall forecast, they would like to accurately estimate this average with a margin of error of less than $4000.
Standardized scores offers a way of comparing norm-referenced scores. The z-score distribution is based on knowing how many standard deviations away from the mean a certain score is.
a random sample of 6 music majors playing song s counted the number of mistakes each made. then these musicians played
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
a national survey is conducted to assess the association between hypertension and stroke in persons over 75 years of
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
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