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A random sample of 25 observations was taken from a normally distributed population. The average in the sample was 84.6 with a variance of 400.
A) Construct a 90% confidence interval for mu.B) Construct a 95% confidence interval for mu.C) Discuss why the 90% and 99% confidence intervals are different.D) What would you expect to happen to the confidence interval in part A if the sample size was increased?
Assume the reliability of a product is given by an exponential distribution with a mean of 1 year. How long would it take to achieve a 10% failure rate?
a) Do a test to see if workers attitudes on this matter have changed using a 90% alpha. b) Explain to management what your findings are and what this suggests about future decisions vs work options.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
A random sample of 12 single men were asked if they would welcome a woman asking them for a date. using the binomial probability table, find the probability that: none of the men will say yes.
Determine the first two cumulants also the ratio between the standard deviation and average energy. Explain why distribution becomes extremely narrow.
A company has set a goal of developing a battery that lasts over 5 hours in continuous use in a sample of 42 of these batteries the mean life time was 306.25 hours with a standard deviation of 29.31
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
Find the LCD for the following rational expressions, and convert each rational expression into an equivalent rational expression with the LCD as the denominator.
Employees of a local university have been classified according to gender and job type.
Judy's measured potassium level varies according to the Normal distribution with mean = 3.8. If a single potassium measurement is made, what is the probability that Judy is diagnosed as hypokalemic?
The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. What proportion of students drank 7 or more cups of coffee per day?
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