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When a population mean is compared to to the mean of all possible sample means of size 25, the two means are
a. equal
b. not equal
c. different by 1 standard error of the mean
d. normally distributed
65% were not interested in returning to work. Find the 95% confidence interval of the true proportion of workers who do not wish to return to work.
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
If 2 circuit boards are selected at random without replacing the first, what is the probability both circuit boards are defective?
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
Which probability distribution is suitable when sampling without replacement?
What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
For the leading health maintenance organization (HMO) firms,
when 100 students took a test the average score was 77.1. two more students took the test. the sum of their scores was
A company's headquarters is located in downtown Chicago. The company is interested to know the mean driving time of its employees if they require their employees to start working at 6:00 am. Fifty employees are randomly sampled over four weeks and..
A sample of 70 orders revealed that 57 were delivered in promised time. At .02 significance level, can we conclude that less than 87 percent of orders are delivered in less than 10 minutes?
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
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