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Here are the shopping times (in minutes) for a sample of 21 shoppers at a particular grocery store:
26 23 44 41 38 35 31 28 25 22 43 40 37 34 31 43 43 39 39 36 36
Draw the frequency polygon for these data using an initial class boundary of 21.5, an ending class boundary of 46.5 and 5 classes. Note that you can add or remove classes from the figure. Label each class with its midpoint.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
If θ1 and θ2 are unbiased estimators of θ, show that θ3=k1θ1+ k2θ2 is biased estimator of θ. What condition must be imposed on constants k1 and k2, so that θ3 is an unbiased estimator of θ?
Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent.
The sample produced a mean of 535 mL with a standard deviation of 0.47 mL. Assume that the distribution of the amount of lotion is approximately normal.
In a research study, what does statistically significant mean? How are decisions made on data based on significance? What do you do with data that is not significantly different?
Find a 95% confidence interval for the mean price of all summer sleeping bags.
A multiple choice test has three questions with 5 possible answers (and oly one right answer each). You decide to randomly guess the right answer.
What is the optimal strategy for producing 500 tons of newsprint pulp, 600 tons of packaging pulp, and 300 tons of print stock quality pulp at minimum cost?
A research study comparing college alcohol use in the United States and Canada reports that more Canadian students drink but American students drink more Is this study an example of an experiment? Explain why or why not.
A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
Does the overall data support the mayor's claim?
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