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Question: The time it takes a mechanic to tune an engine is known to be normally distributed with a mean of 45 minutes and a standard deviation of 14 minutes.
a. Determine the mean and standard error of a sampling distribution for a sample size of 20 tune ups. Draw a picture of the sampling distribution.
b. Calculate the largest sampling error you would expect to make in estimating the population mean with the sample size of 20 tune-ups.
recoding a new variable to the data of people who have voted
At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
A professor wants to compare the students' midterm and final exam results. For a random sample 10 students, the scores obtained are as follows. Find the sample correlation between the midterm and final examination results
Construct a box plot using a graphing calculator for each data set, and state which box plot has the wider spread for the middle 50% of the data.
write a function that calculates the average and range of every five observations in the dataset? if the number of
Security B has an expected return of 12 percent, a standard deviation of returns of 10 percent, a correlation with the market of 0.7 and a beta coefficient of 1.0.
The following sample of size 11 was taken from a population that is not normally distributed: 87 59 77 65 98 90 84 56 75 96 66
determine the total area under the standard normal curve in parts a through c below. a find the area under the normal
Construct a boxplot for the husbands' heights.- Use the range to approximate the standard deviation for these heights.
how many wayss are there to select an unordered group of eight numbers between 1 and 25 inclusive with repetition? in
A 95% confidence interval for the mean of a sample of positive numbers can include negative values if the sample size is small and the data are highly skewed. Is it possible for the nonparametric confidence interval for the median based on a samp..
in the week before and the week after a holiday there were 10000 total deaths and 4979 of them occcured in the week
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