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A woman sells an average of 300 books per month, with a standard deviation of 50. Over the next ten years, how many months will she sell more than 375 books? (round to the nearest month, if necessary)
You are asked to conduct a study to determine if gender has any bearing on the choice of a dog or cat as a pet. You take a random sample of 350 adults and ask each what kind of pet they would prefer, a dog or a cat?
For the following ANOVA experiments, determine the critical region(s) and critical value(s) that are used in the classical approach for testing the null hypothesis
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk.
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
SmartMinds University is running a promotional raffle that offers a chance to win either a 1-year discount on tuition cost (which results in a $500 savings) or a 2-year discount on bookstore purchases. Is this promotion worth it if the tickets cost..
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
A parent is deciding which babysitter to use in the neighborhood. Babysitter A charges $20 per hour and a base rate of $60 per day. Babysitter B charges a base rate of $50 per day and $25 per hour.
What is the probability that a random sample of 36 students will have a mean verbal sat score that is great than 535?
It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
Does dichotomizing the dependent variable (i.e. logistic regression) decrease power in relation to a continuous dependent variable?
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