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A marketing study conducts 60 significance tests about means and proportions for several groups. Of them, 3 tests are statistically significant at the 0.05 level. The study's final report stresses only the tests with significant results, not mentioning the other 57 tests. What is misleading about this?
A large population of overdue bills has balances that fallow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100.
A scientist wishes to find the 98% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
Determine whether the survey figure for urban people is also true for rural people on the basis of the sample data.
a population has a mean of 50 and a standard deviation of 13. if a random sample of 36 is taken what is the probability
the traditional view about the normal curve in psychology is that normal curves area rare in nature but often occur in
A Tamiami shearing machine produced 8 percent defective pieces. The quality control engineer has been checking the output by almost continuous sampling. What is the probability that in a sample of 9 pieces:
a professor gives tests that are either hard medium or easy. if she gives a hard test her next test will be either
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
show all your workpermutations with objects together how many ways can the words be rearranged in allababa with baba
Quarters with weights between 5.550 g and 5.790 g. If 280 different quarters are inserted into the vending machine, what is the expected number of rejected quarters?
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
intelligence tests are designed to provide a normal distribution of iq scores with a mean of 100 and a standard
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