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The total cholesterol level of US females 2 years old or older is normally distributed with a mean of 206 mg/dl and a standard deviation of 44.7 a. determine the percentage of US females 20 years old or older who have a serum total cholesterol level between 1150 mg/dl and 250 mg/dl b. determine the percentage of US females 20 years old or older who have a serum total cholesterol level below 220 mg/dl c. obtain and interpret the quartiles for serum total cholesterol level of US females 20 years old or older d. find the and interpret the fourth decile for serum total cholesterol level of US females 20 years old or older
A study concluded that waist to hip ratios are a better predictor of 5-year survival than more traditional height-to-weight ratios.
A standard deviation of 1.5 years. What is the probability that someone will keep a color TV fewer than 10 years before replacement?
the citizens of a certain community were asked to choose their favorite pet. the pie chart below shows the distribution
What is the break-even cost? What is the profit for 75 units of feed sold? How many units must be sold to produce a profit of $1020?
Compute the mean and variance of the discrete probability distribution and determine the probabilities of the following events using the binomial formula.
A survey of 608 adults showed that 401 of them approved of the way city government was being run. Find a 99% confidence interval for the true proportion of voters who approve the way city government is being run.
Evaluate the multiple regression model between quantity sold (Y) and following explanatory variables: average price of deep-dish pizzas, monthly advertising expenditures, and disposable income per household in areas surrounding outlets.
In a nationwide survey of n = 1,030 adults, 6% answered yes to the question "During the last year did anyone break into or somehow illegally get into your home or apartment?"
Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
Is there any significant relationship between gender and the variable IQcat? If so, what is it and is the mean exam grade significantly larger than 75?
Let μ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the industry requirement to be met if μ is at least 25. Set up the null and alternative hypotheses needed to attempt to show that the industry requirement ..
Assume a business researcherwishes to test hypothesis that greater proportion of marketing managers keep track of such obligations.
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