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We are currently studing inference on population proportions and hypothesis testing for one and two proportions in our Statistics class. We must assume we are a fourth-grade teacher and we've saved extensive records of all our students for the past five years. Assume that our students are a sample of all fourth-graders in our state. For the question, we must state what test to use, how we would set up the data and the Ho/Ha if applicable, using full sentences.
Question: Redheads are rumored to have fiery tempers and you think it might affect their grades. Is there any significant difference in grades between blondes, brunettes and redheads?
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
What is the effect on a confidence interval if one decreases both sample size and the level of confidence?
The value of R-square indicates the amounts of variation in the dependent variable that is explained by the independent variable.
Your office has just received 140 insurance claims to be processed in the next few days. Find the following probabilities.
Suppose that the population of heights of female college students is approximately normally distributed with mean m of 66.24 inches and standard deviation s of 5.07 inches.
I read that a range of expression is a set of values of a given expression. This set may consist of the whole set of cardinals numbers xy or of a proper subject of the set of cardinals (as the expression 2x, whose range is the even cardinals).
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
What is the decision regarding H0? " "Imagine you are conducting a left tailed test of proportions; level of significance is 0.05; calculated z-value is -2.00;
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that:
The number of runs with respect to the sample median is:
Using test data on 20 types of laundry detergent, an analyst fitted a regression to predict CostPerLoad (average cost per load in cents per load) using binary predictors.
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