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A ski shop manager claims that the average of the sales for her shop is $1800 a day during the winter months. Fifty winter days are selected at random, and the mean of the sales is $1830. The standard deviation of the population is $200. Can one reject the claim at alpha = 0.05? Use the traditional method
Find that 116 plan to renew their subscriptions. Use (a=0.01). p = the population of subscribers to Golf Illustrated who renew. Calculate the p-value.
Consider the experiment of tossing a fair coin three times and observing the number of heads that result (X = number of heads).
The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed
Identify the independent and dependent variables. Indicate the number of levels in the independent variable and describe each level.
(a) Interpret the slope of the fitted regression Sales = 842 - 37.5 Price. (b) If Price = 20, what is the prediction for Sales? (c) Would the intercept be meaningful if this regression represents DVD sales at Blockbuster?
Fix-It Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed.
If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under.
Concept of statistical signi cance
If random samples, each with n = 9 scores, are selected from a normal population with µ = 80 and σ = 36, then what is the expected value for the distribution of sample means?
In random samples of 25 from each of two normal populations, we found the following statistics: Estimate the difference between the two populations means with 95% confidence.
What is the level of measurement for the variable, "political ideology" measured as "Very Conservative", "Conservative","Moderate", "Liberal" and "Very Liberal".
In a particular region of Rhode Island, it is known that fisherman's trap on average of 32 pounds of lobster per day with a standard deviation of four pounds.
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