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A group of investors wants to develop a chain of fast-food restaurants. In determining potential costs for each facility, they must consider, among other expenses, the average monthly electric bill. They decide to sample some fast-food restaurants currently operating to estimate the monthly cost of electricity. They want to be 99% confident of their results and want the error of the interval estimate to be no more than $100. They estimate that such bills range from $600 to $2,500. How large of a sample should they take?
Entire commercial airline industry, consider a random sample of 200 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution.
Which measure of family wealth is most important, when making political decisions, the national mean, median or mode?
Develop a regression model that would predict the DJIA based on the S&P 500 index. Based on this model, what would you expect the DJIA to be when the S&P is 1,100? What is the correlation coefficient (r) between the twomarkets?
a -0.947 correlation coefficient has been found between two variables after examining 43 pairs of observations. what
Draw the graph for the distribution of these data and label it both in terms of raw scores and z-scores. Identify the percentage of students who scored in the following ranges of raw scores:
At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? State your null and alternative hypotheses. (Note: while the small sample size could justify use of the non- parametric Kruskal-W..
The weight of a product is normally distributed with a mean of four ounces and a variance of .25 "squared ounces." What is the probability that the randomly selected unit from a recently manufactured batch weighs no more than 3.50 ounces.
If the p value for a test for difference of educational level of two groups is p=0.0184, is the difference statistically significant at the 0.01 level?
Develop an estimated regression equation relating the top speed with the boat's beam and horsepower rating and compute and interpret and R2 and R2a
What percentage of the averages or medians of the sample will be greater than 140 seconds?
Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
a farmer believes that the yields of his tomato plaints have a normal distribution with an average yield of 11 lbs and
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