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A lathe is set to cut bars of steel into lengths of 6 centimeters. The lathe is considered to be in perfect adjustment if the average length of the bars it cuts is 6 centimeters. A sample of 121 bars is selected randomly and measured. It is determined that the average length of the bars in the sample is 6.08 centimeters with a standard deviation of 0.44 centimeters.
a. Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
b. Compute the test statistic.
c. Using the p-value approach, what is your conclusion? Let α = .05.
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
According to Cerulli Associates of Boston, 30% of all CPA financial advisors have an average client size between $500,000 and $1 million. Thirty-four percent have an average client size between $1 million and $5 million - What is the expected numb..
These problems related to Basic Statistics and discuss about type I and type II errors and their critical role in statistical tests
You find the sample standard deviation of sample A to be 12.6 and the sample standard deviation of sample B to be 15.9. You could not perform a test in which the alternative hypothesis is σ sub A
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
Suppose that you collect data on apartment prices in Tempe. You look at 41 different apartment and find a mean of 757 and a standard devaluation 156.7. Construct a 95% confidence interval for the mean apartment price. That interval is? Please show..
Predict the final grade for a student who studies statistics 8 hours per week (x1), attends 34 classes (x2), and turns in 11 assignments (x3).
a company that produces dvd drives has a 12 defective rate. let x represent the number of defectives in a random sample
Draw a picture of the appropriate sampling distribution, and show where the value P^1 - P^2 = 0.13 falls on it.- Find the value of the standardized statistic corresponding to P^1 - P^2 = 0.13.
About 500 are observed, and 30% are observed being returned to Enterprise. Is there statistical evidence to support the claim of the executives? Conduct a complete (5 step) hypothesis test using a .05 significance level (95% confidence).
The results are shown here. At Alpha = .01, can it be concluded that the sessions help to improve the students' mathematical skills?
what is the probability of obtaining 2 heads out of 5 tosses of a coin in a binomial
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