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According to recent surveys, 58% of households have a personal computers. If a random sample of 159 is selected, what is the probability that more than 81 but fewer than 105 have a personal computer?
The ANOVA summary table below is the result of a regression of sales on year of sales. Is the relationship statistically significant at .05? Comment.
Construct a 95% confidence interval for the population mean.
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
Using the empirical rule, what is the approximate percentage of women between 156cm and 166cm? Using Chebyshev's Theorem, at least what percentage of women are between 149cm and 173cm?
Both SAT and ACT scores are normally distributed. What is the probability that a randomly selected high school senior's score on the mathematics part of the SAT will be more than 630?
In performing a chi-square test of independence, as the difference between the respective observed and expected frequencies decrease, the probability of concluding that the row variable is independent of the column variable increases.
He measured whether their answers to a standard set of mental problems were affected. His approach to manipulating his independent variable involved
In the game of roulette, a ball is dropped into a spinning wheel, finally landing on one of the wheel's 38 different slots. The wheel has 18 black slots, 18 red slots, 1 green zero, and 1 green double-zero. Suppose the wheel has landed on red 9 ti..
Which variable is the independent variable and which is the dependent variable? Write out the regression equation and sketch it on the plot. What percentage of the variability in the defect rate can be explained by differences in volume?
A local Junior High principal has decided to give an award to any student who scores in the top 15% of statewide scores. How high should a student score be to win this award?
In the order of operations Pemdas requires that exponentation takes precedence over multiplication, so we cannot multiply 4*2 without first evaluating 2^x, but we could divide both sides by 4.
Provided that the selected student excels in sports, determine the probability that the student is a boy?
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