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Power+, produces AA batteries used in remote-controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 17 hours and a standard deviation of 4.6 hours. As a part of its testing program, power+ tests samples of 25 batteries. Use for the Z-values.
a. What can you say about the shape of the distribution of sample mean?
Shape of the distribution is
b. What is the standard error of the distribution of the sample mean?
Standard error
c. What proportion of the sample will have a mean useful life of more than 18 hours?
Probability
What proportion of the sample will have a useful life greater than 16.5 hours?
What proportion of the sample will have a mean useful life between 16.5 and 18 hours?
what percent of the total number of seeds germinated?
Simulate a random selection of three people from the applicant pool, and make a decision about the likelihood that a fair process would result in hiring all women.
The X variable is time and the Y variable is examination grade. Calculate r. Use Table A to determine if it is statistically significant.
a professor is interested in the number of students who use the campus library for academic purposes. she takes a
Calculate the predicted selling prices for houses currently assessed at $155,000, $220,000, and $285,000
You randomly select six women and ask each if she considers herself a fan of professional baseball. Construct a binomial distribution using n=6 and p=0.39.
What is the correlation coefficient for the data above ?What does it tell me about the relationship between hours of driving and the number of gallons.
Construct a scatter plot for these data.- Find the estimated regression line. Add a graph of the estimated regression line to the scatter plot in part (a).
(a) Determine the gain K so that the phase margin is 45°. (b) For the gain K selected in part (a), determine the gain margin, (c) Predict the bandwidth of the closed-loop system.
Some of the methods in this section are approximations rather than exact probability results. We have given rules of thumb for safe use of these approximations.
please give one example to explain the difference between an outlier and a data point with high leverage value. you can
Calculate the centerline and control limits for the X‾- and s-charts.- Estimate the process mean and standard deviation, assuming the process to be in control.
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