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n a recent article (Nanci Hellmich, "‘Supermarket Guru' Has a Simple Mantra," USA Today, June 19, 2002, 7D) it claimed that the average supermarket trip takes 22minutes. Suppose that in an effort to test this claim, a sample of 50 shoppers at a local supermarket were a studied. The mean shopping time for the sample of 50 shoppers was 25.36 minutes with a standard deviation of 7.24 minutes. Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is different from the claimed value of 22minutes?
A group of teenagers were monitored closely over the period of several weeks to measure how frequently they watched violent television programs.
A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
You are asked to match three songs with the performers who made those songs famous. if you guess, the probability distribution for the number of correct matches is:
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
To find out whether two categorical variables are independent, one should use the.
A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds. What is the probability that exactly 20 germinate?
Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
Construct the 90% and 99% confidence interval for population mean. Which interval is wider? If convenient, utilize technology to construct confidence intervals.
There are three types of bread, three types of meat, three types of cheese, and four types of topping. How many different sandwiches can the restaurant make?
Write the null and alternative hypotheses. Identify which is the claim. A light bulb manufacturer claims that the mean life of a certain type of light bulb is less than 775 hours.
You are looking at a bond to add in your portfolio. The bond has a 7.2 percent coupon (paid semiannually), 10 years left to maturity, and can be purchased at par ($1,000).
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