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Historical data for local steel manufacturing company illustrates that average number of defects per standard sheet of steel is 2. Additionally, number of defects per unit is distributed according to Poisson distribution. Batch has just been completed. Determine probability that first three units manufactured in this batch will contain at least total of 4 defects?
Duplicate readings, using two separate instruments, were obtained on ten samples. What is the tabular value of the statistic used to determine the significance of the mean difference at the .05 level of probability?
Otherwise you lose $1. If you make this wager very many times, what will be the mean outcome?
Pepsi wanted to test to determine if the males preferred Pepsi more than the females. (a) PConduct the appropriate test and describe the results (ick your own alpha value)
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
You read a report that says, "On the basis of the simple random sample of 100 high school seniors that took the SATM test this year, a confidence interval for µ is found to be 512.00 ± 25.76." What was the confidence level used to calculate this..
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make?
The average thickness of books on a library shelf is 8.3 centimeters.the standard deviation is 0.6 centimeter. If 20% of the books are oversied, find the minimum thickness of the oversized books on the library shelf.
If the population mean is estimated within two days, how many salespeople should be sampled?
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
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