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Ran parts and found 1% defective(1 out of 100). Made a change to the process and want to rerun parts. How many parts do we need to check (and find 0% defective) for a 90% confidence factor that there are not any defects in the rerun?
A company supplies poultry farmers with hens, advertising that a mature B300 Layer produces eggs with a mean weight of 60.7 grams. Suppose that egg weights follow a Normal model with standard deviation 3.1 grams.
A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
A stationary store wants to estimate the mean retail value of greeting cards that it has in inventory A random sample of 100 greeting cards. a mean value of 2.55 and standard deviation of 0.44
While in July the mean high temperature is 74oF and the standard deviation is 8oF. In which month is it more unusual to have a day with a high temperature of 55oF?
What is the formula used to get percentile from z-score? I have z-scores but am using excel and want to be able to type in a formula to figure percent instead of coming here and continuing to figure it out.
If 28% of the residents play poker and garden and 70% of the residents play both shuffleboard and poker, then find the probability that a resident plays poker, given that they garden.
Using part(a), explain to investor differences between distribution of performance figures for the 2 kinds of stock funds.
Use the normal model to determine the probability that a wide receiver gained 325 yards or less in the 2006 season.
Compute population µ and ð for the population. Find the z score for each population transform the original population into a new ppulation of N=5 with a mean µ=60 standard dev.ð=8.
An article in Parenting magazine reported that 60% of Americans needed a vacation after visiting their families for the holidays. Suppose this is the true proportion of Americans who feel this way. A random sample of 100 Americans is taken.
The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium..
Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
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