Confidence interval for the mean length
Someone wonders if movies are too long. A random sample of 45 releases had a mean length of 112.1 minutes and a standard deviation of 22.4 minutes. Construct a 99% confidence interval for the mean length of all recently released movies.
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Suppose that the data has the normal distribution and number of observations is greater than fifty. Find out the critical z value employed to test a null hypothesis.
The mean temp in the LA is 66.3 degrees F with the standard deviation of 8 degrees F. The temp readings are usually distributed. Determine the probability the temp in LA is greater than 85.2 F any given day.
Consequently, the designers want to know the minimum sample size needed so that observing K or fewer defectives in the sample will demonstrate that the true probability of failure for the one-shot device is no greater than p.
The production foreman for the Florida fruit company determines that the average sale of the oranges is 4,700 and the standard deviation is 500 oranges. Sales follow the normal distribution. What is the probability that sales will be less than 4,3
Make a 95% confidence interval estimate of the population mean rating for Miami. Enter your answer using parentheses and a comma, in the form (n1, n2).
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Come up with an expression that the probability of Z will still be null after this. At the end of this procedure, what is the expected size of Z?
Suppose the random variable X is best described by a normal distribution with mean= 150 and standard deviation= 15. Find the values of x such that
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