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A trucking firm has trucks that average a payload of 31.5 tons and a standard deviation of 3.75 tons. An accounting firm is auditing the shipping orders for the past year for billing errors. It chooses a random sample of 64 shipping orders. What is the probability that the sample mean weight will be within 2.5 ton of the true population mean of 31.5 tons?
the breaking strength of flimsy safety belts is known to be approximately normally distributed with a population mean
Tthe job is normally distributed and has a mean time of 30 minutes with a standard deviation of 8 minutes. How much time should the employer allow employees to finish the job?
When selecting 3 different side dishes from the 16 available choices. What was the incorrect number stated by Joe Montana in the ad?
For a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5% level of significance level, with both sample sizes equal to 13? Assume the population standard deviations are equal.
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
a couple wishes to borrow money using the equity in their home for collateral. a loan company will loan them up to 70
Is this a statistically significant difference? Write the two statistical hypothesis and conduct the appropriate test with your conclusion justified.
A. What is the probability of discovering that your five best friends all have cellphone numbers ending in 7?
We wish to construct a 90% confidence interval on the mean of a population known to be normally distributed based on a sample of 20 observations having a sample mean of 8 and a sample standard deviation of 2. What is the standard error?
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 secon..
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
To investigate whether female executives are experiencing pay-discrimination, a researcher samples the incomes of 300 male and 300 female executives. Which procedure would be appropriate?
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