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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)
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
The calculated chi-square test statistic and the table value for a 0.05 significance level are:
After an unusually dry atumn, a radio announcer ia heard to say, "Watch out! We'll pay for these sunny days later on this winter." Explain what he's trying to say, and comment on the validity of his reasoning.
Plot a scatter diagram of the results with Depth of Water as the independent variable.
White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
This linear regression model was fitted to a sample of size 50 to produce the following regression equation: yhat = 145 + 1.2x1 + 300x2.
A certain state lottery awards 418 prizes; 28-$200 prizes, 120-$25 prizes and 270-$20 prizes, for every 10,000 tickets sold.
Examine the histogram of the standardized residuals for the regression of annual earning on annual hours worked among Registered Nurses below. Which conclusions can be made about the model using this graphic?
What is the best estimate of the average tread life in miles for the entire population of these tires?
Graph inequality. Using the test point method.
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles. Please explain these concepts and in particular address the question
USA snapshot presented a bar graph depicting business travelers' impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 resp..
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