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Digital camcorder repair service has set the goal not to exceed average of 5 working days from time unit is brought in to time repairs are completed. Random sample of 12 repair records showed following repair (in days) 9,2,5,1,5,4,7,5,11,3,7,2.
Ho: u< or equal to 5 days versus H1: u> 5 days(a) Should you reject the Ho if t > 1.796?(b) Compute the t-value(c) Should null hypothesis be rejected?(d) Is average repair time longer than 5 days?(e) At a=.05 is the goal being met?
Create a 95% confidence interval for population proportion of positive drug tests.
Proponents and critics of this legislation have looked at the number of traffic fatalities on major U.S. highways (e.g., I-90, I-65, I-75) for the years preceding and following this legislation. Sonny examined the traffic fatalities on each of the..
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
Use the normal distribution of SAT critical reading scores for which the mean is 507 and the standard deviation is 121. Assume the variable x is normally distributed.
How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?
What role does a financial department play in valuing business opportunities and what are some of the key financial concepts that valuation work must consider?
If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. Round to the nearest whole number.
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
Suppose that 10% of all adults jog. An opinion poll asks an SRS of 400 adults if they jog. a) What is the sampling distribution of the proportion p^ in the sample who jog?
Among 620 adults selected randomly from among the residents of one town, 18.9% said that they favor stronger gun-control laws.
If the sample size is 36 with three treatment means (response variables) and you are performing an ANOVA, then the degrees of freedom for the error term will be:
A stationery store wants to estimate the total retail value of the 300 greeting cards that it has in its inventory. What are the upper and lower limits of the 95% confidence interval estimate of the population total value of all greeting cards tha..
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