A company has tested a new cellular battery. The mean number of hours that a newly...
A company has tested a new cellular battery. The mean number of hours that a newly charged battery remains charged is 52 hours, with a standard deviation of 7 hours.
What is the percent of batteries that will remain charged less than 3 hours?
_____% (Round to one decimal place as needed)
Areas Under the Standard Normal Curve (the z-table)
z A
.00 .000
1.00 .341
2.00 .477
3.00 .499
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A company has tested a new cellular battery. The mean number of
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A company has developed a new battery, but the average lifetime is unknown. In order to estimate this average, a sample of 21 batteries is tested and the average lifetime of this sampled batteries is 889 hours and sample standard deviation is 23.5 hours. Here the population of interest is: Olifetime of newly developed batteries O average 21 batteries, which were tested all newly developed batteries by the company Sutorit Answer Tries 0/2 Here the sample is: lifetime of newly...
Quality Control: A battery company advertises that Its batterles last 245 hours. There have been several complaints that the batterles don't last that long, so an Independent analytics agency is hlred to test them. For the 37 hatteries they tested, the mean lifetime was 244 hours with a standard deviation of 1.3 hours. Conduct a hypothesis test to determine if the batteries last as long as the company claims. Use α-0.05 (a) A consumer advocate says that 244 hours Is...
The number of successes and the sample size for a simple random sample from a population are given below. X=7, n=28, Hop=0.2, H. p> 0.2, a=0.05 a. Determine the sample proportion b. Decide whether using the one proportion z-test is appropriate. c. If appropriate, use the one proportion z-test to perform the specified hypothesis test. Click here to view a table of areas under the standard normal curve for negative values of z. Click here to view a table of...
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