A study was conducted on the life of Duracell batteries and on the life of Energizerbatteries. The study found that a sample of 10 Duracell batteries had a mean life in hours of 26.2 witha standard deviation of 4.1 and a range of 24. The results for a sample of 10 Energizer batteries wereas follows (in hours):2.15181923252528303438(a) Find the mean and standard deviation for the Energizer batteries.(b) Find the variance for the Energizer sample.(c) Find the range for the Energizer sample.(d) Which batteries have a more uniform life in hours? Why?

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Steve believes that his wife's cell phone battery does not last as long as his cell phone battery. On ten different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 24.1 hours with a standard deviation of 10.3 hours. He measured the length of time his wife's cell phone battery lasted on eight different occasions and calculated a mean of 16.8 hours with a standard deviation of 7.8 hours. Assume that the population variances are the same. Let Population 1 be the battery life of Steve's cell phone and Population 2 be the battery life of his wife's cell phone. Step 2 of 2: Interpret the confidence interval obtained in Step 1. Answer 1 Point E Tables E Keypad Keyboard Shortcuts O Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 99% confidence level. Since the confidence interval does not contain zero, the data do not provide evidence that the population means are…
The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players' salaries and 35 football players' salaries is selected. The mean salary is determined for both samples. Let i,-i, represent the difference in the mean salaries for baseball and football players. Which of the following represents the shape of the sampling distribution for ī, -i,? skewed right since the populations are both right skewed skewed right since the differences in salaries cannot be negative approximately Normal since both sample sizes are greater than 30 approximately Normal since the sum of the sample sizes is greater than 30
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