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A company that produces AA batteries makes the following statistical announcement: "Our AA batteries last 7.5 hours plus or minus 20 minutes, and our confidence in that interval is 95%.". They tested a random sample of 40 batteries using a special device designed to imitate real-world use and recorded data on battery lifetime.
Determine the sample mean (in minutes).
Determine the standard deviation.
Suppose the average value of P is $ 3 and average value of Po is $ 6. Determine the price elasticity at average values of P and Po?
In order for Samuel's average calorie intake to equal a daily average of 2200 calories, how many calories of food must he consume on Thursday?
Determining the strength of a correlation is very important to determine how well one variable can predict another. To determine the strength of a correlation, we have to calculate the correlation coefficient, r.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
If the Pearson Correlation is 0.18, what do we get, what is the value called, and what does it tell us?
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
Explain the chi-square test of homogeneity and show the formula for the test statistics for the test of homogeneity. Describe a sign and test and show the six steps of the test-of-hypothesis procedure.
In recent years, 3.4 children per year get sick with measles in Minnesota. If a recent year is taken at random, what is the probability that:
We can determine the following information about the amount remaining in a toothpaste tube without invading anyones privacy. How much toothpaste would you expect to be remaining in the tube?
State the Null Hypothesis and the Alternative Hypothesis. Determine the test statistic. Determine the P-value
An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
From the test data, can we determine whether the oven has an effect on the cake's density? The null hypothesis should be: Oven has no effect on density.
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