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At Mike's Auto Service, the mean time to diagnose a problem is 30 minutes with a standard deviation of 8 minutes. The mean time to perform the repairs once the diagnosis is complete is 180 minutes with a standard deviation of 45 minutes.
a) Find the mean and standard deviation of the total time to complete an auto repair.
b) If Mike charges $40 per hour for diagnosis and $120 per hour for repair, find the mean total cost and the standard deviation of the total cost.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
question an employer wants to know what types of activities encourage her employees to exercise.nbsp the first month
question 1 a long-term record for weather in a certain province shows that the annual precipitation has a mean of 39.67
A standard deviation of $1500. at the 0.01 level of significance, can it be concluded that state employees earn on average less than federal employees?
test 1perform the following two-tailed hypothesis test using a .05 significance levelintrinsic by genderstate the null
1.i have fit the equation y 2.5 3x to a set of data. the residual for the point 5 10 isa.7.5.b.-7.5.c.-27.5.2.i have
The response times for the first month are 26, 30, 28, 29, 25, 28, 32, 35, 24, 23 min. Using the .05 significance level, did she keep her promise?
question five factories reported the following numbers of minor accidents in a year.factory12345number of
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
He received a score of 70 on a biology test for which the class mean was 70 with standard deviation of 4. On which test did he do better relative to the rest of the class?
in a study in which k 3 n 21 mean of x1 45.3 mean of x2 16.9 and mean of x3 8.2 you compute the following sums of
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