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A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The population standard deviation is known to be $60. Is it necessary to know anything about the shape of the distribution of the account balances in order to make an interval estimate of the mean of all the account balances?
The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
A bag of jelly belly candies contains the following colored jelly beans: red (10), blue (2), orange (5), brown (21), green (0), and yellow (18). Construct the probability distribution for x.
Sue and Jim approached the machine first. They both said they wanted red gum balls. What is the likelihood they will get their wish?
Suppose that it is important to demonstrate that the wall thickness exceeds 4.0 mm. Test appropriate hypotheses using these data. Draw conclusions at α= 0.05.
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
Identify the sample and population. Also, determine whether the sample is likely to be representative of the population.
Name three elements of the inferential statistical analysis.
Smoking on campus. suppose 20% of the students on campus smoke. you select two students at random. In what percentage of samples will both students be smokers?
What is the probability that (a) the birthdays of twelve people will fall in twelve di?erent calendar months (assume equal probabilities for the twelve months).
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
A bookcase contains 3 statistics books and 4 biology books. If 2 books are chosen at random, find the chance that both are statistics books.
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