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Question: 1. Refer back to the pizza-delivery Try It exercise. The population standard deviation is six minutes and the sample mean deliver time is 36 minutes. Use a sample size of 20. Find a 95% confidence interval estimate for the true mean pizza delivery time.
2. Suppose we know that a confidence interval is (42.12, 47.88). Find the error bound and the sample mean.
consider a random sample of size n from a bernoulli distribution xi bin1p. for a uniform prior density p unif01 and
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
the move-it company has two plants building forklift trucks that then are shipped to three distribution centers
Based on this data can the college conclude that the students in the new program performed better than the rest of the class> A one-tailed test is used equalling .05
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
many studies have found that people who drink alcohol in moderation have lower risk of heart attacks than either
State which model the data follow and plot the scatter diagram.- Do you expect the r to be positive or negative from looking at the scatter diagram? Should b be positive or negative?
a study was conducted to determine whether persons in suburban district ii have a lower mean income than those in
Is P(K + 1) = P(K)(365-K)/365 and, If so, why? Find the smallest class size K for which the probability that two or more students have the same birthday exceeds 0.5.
A particular intersection in Delaware is equipped with a surveillance camera. The number of traffic tickets issued to drivers passing through the intersection follows the Poisson distribution and averages 4.5 per month.
A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
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