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To evaluate the performance of a certain brand of alkaline battery, researchers at a consumer testing laboratory measure the lifetime of 160 1.5-volt batteries. Battery lifetime for this study is defined as the time it takes the voltage to drop to 1.0 V under a standard electrical load. The researchers determine that the mean lifetime is 48.3 hours with a standard deviation of 15.7 hours.
Assuming a normal distribution of battery lifetimes,
(a) Find the probability that a battery's voltage will drop below 1.0 V after 20 hours of use.
(b) Find the probability that a battery's voltage will drop below 1.0 V after 70 hours of use.
(c) If the daily production rate of 1.5-V batteries is 25,000, how many batteries per day will have lifetimes of 20 hours or less and 70 hours or more?
Quality Progress, February 2005, reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the voice of the customer.
q1. the mean of a normal probability distribution is 60 the standard deviation is 5.a what percent of the observations
North Carolina State University looked at the factors that affect the success of students in a required chemical engineering course. Students must get a C or better in the course in order to continue as chemical engineering majors.
when the variances of the population distribution and the sampling distribution of means are compared thea. variences
hypothesis test for one sample meana survey of 50 clientsin january 08 fifty clients of a county mental health mental
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
Probabilities can be approximated by the normal probability distribution? Explain What is the probability of between 100 and 110 successes? What is the probability of 130 or more succeses?
Bimodal distribution with a very large standard deviation for the population. For most teachers such a distribution makes the matter of how to teach very tricky.
The scores of students taking the Scholastic Aptitude Test (SAT) are normally distributed with a mean u = 1035 and a standard deviation o = 131.
Identify the significance level, the test statistic, and the critical value, state whether you are rejecting or failing to reject the null hypothesis statement and explain how the results could be used by the manager of the company.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
suppose that the proportions of blood phenotypes in a particular population are as followsa 0.42 b 0.10 ab 0.04
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