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Progress in math scores. Every few years, the National Assessment of Educational Progress asks a national sample of eighth-graders to perform the same math tasks. The goal is to get an honest picture of progress in math. Here are the last few national mean scores, on a scale of 0 to 500:
(a) Make a time plot of the mean scores, by hand. This is just a scatterplot of score against year. There is a slow linear increasing trend.
(b) Find the regression line of mean score on year step-by-step. First calculate the mean and standard deviation of each variable and their correlation (use a calculator with these functions). Then find the equation of the least-squares line from these. Draw the line on your scatterplot. What percent of the year-to-year variation in scores is explained by the linear trend?
(c) Now use software or the regression function on your calculator to verify your regression line.
it is known that 20 of the applications received for a particular credit card are rejected. what is the probability
a student is taking two courses history and math. the probability the student will pass the history course is .51 and
Does the histogram indicate normality for the data distribution? Explain - does the normal quantile plot indicate normality for the data distribution? Explain.
Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Text Resources link.
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
Assume a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another
What is the probability that the next State of the Union Address will be more than 90 minutes long?- What is the probability that the next two State of the Union Addresses will be less than 30 minutes long?
Forty-six percent of a population possesses a particular characteristic. Random samples are taken from this population. Determine the probability.
an urn contains w1 white and b1 black balls. a second urn contains w2 white and b2 black balls. a ball is selected at
Student A transfers to FSU and has a cholesterol reading of 199. What is the probability of observing a cholesterol reading of 199 or less?
Make a histogram of the number of rolls the students in your class required to roll doubles.- Describe the shape of this distribution.- What was the average number of rolls required?
The difference between the median and mode
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