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You wish to estimate, with 97% confidence and within 3.5% of the true population, the proportion of computers that need repairs or have problems by the time the product is three years old.
a) no prelimanary estimate is available. Find the minimum sample size needed
b) Find the minimum sample size needed, using a prior study that found that 19% of computers needed repairs or had problems by the time the product was three years old
c) compare the results from parts (A)and (B)
Which is the probability that the median of the sample is between $17 and $20?
A drawer contains 11 identical red socks, and 8 identical black socks. Suppose that you choose 2 socks at random in the dark
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A deck of 52 cards is dealt face up in a row. What is the probability that all 4 aces and all 4 kings are adjacent (but in any order)?
The researchers gave each subject a battery of nine separate neurological and psychological examinations designed to assess their mental capabilities.
What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
A study of classified advertisements in a local newspaper shows that 204 are help-wanted ads, 520 are real estate ads, and 306 are for other ads.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Suppose that you wish to perform a nonparametric test for a difference among the medians of three or more independent populations. Which of these tests would be appropriate?
Compute mean, standard deviation, coefficient of variation and 5 key percentiles for these data.
Determine regression line for predicting January temperature from latitude.
What information is provided by the numerical value of the Pearson correlation? For the following scores, compute the Pearson correlation:
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