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Donations. Organizers of a televised fund raiser know from past experience that most people donate small amounts ($10 - $25), some donate larger amounts ($50 - $100), and a few people make very generous donations of $250, $500, or more. Historically, pledges average about $32 with a standard deviation of $54.
a) If 120 people call in pledges, what are the mean and standard deviation of the total amount raised?
b) What assumption did you make in answering this question?
Discuss the concepts of a parameter, a sample statistic, an estimator, and an estimate. What are the relations among these entities?
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate).
Determine margin of error was used in creating confidence interval above? Determine the sample size required to obtain the margin of error of 10.97 with 90% confidence interval?
Divide your data in half, your first 8 observations and your last 7 observations. Then use ANOVA to test to see if there is a significant difference between the two halves of your data. This list of Webpages that Perform Statistical Calculations h..
A teacher believes that 85% of students in the class will want to go on a field trip to the local zoo.
Explain how this might present a problem if we calculate a simple linear regression equation to predict GPA from number of podcasts downloaded, and explain how a scatterplot might help us identify the problem.
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
Suppose X is a uniform random variable with a = 25 and b = 25.- Carefully sketch a graph of the probability density function for X.
A public opinion researcher has a budget of $20,000 for taking a survey. She knows that 90% of all households have telephones.
Find out and interpret coefficients of correlation and determination for U. S. prices versus Canadian prices.
Yes, trying to create a bar chart but when entering the percentages into SPSS along with the gender and mental health issue, the result would not display accurately. I need to show the relationship between nonoffenders and offenders, male and fem..
Brakes for a model of automobile fail with a Poisson distribution at an annual rate of 4.4/yr. What is the probability that
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