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A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 507 and a standard deviation of 70. A local Junior High principal has decided to give an award to any student who scores in the top 10% of statewide scores. How high should a student score be to win this award? Give your answer to the nearest integer.
Two variables in her spreadsheet, and finds r = 0.06. She decides to conclude there is no relationship between the variables. Was she correct?
Florida consumers are confident about the economy. verify the 90% confidence interval. State in a sentence the meaning of the derived confidence interval .494, .568. What would be your conclusion?
A report on the U.S. economy indicates that 28% of Americans have experienced difficulty in making mortgage payments. A news organization randomly sampled 400 Americans from 10 cities named the "fastest dying cities in the U.S."
The following indices: z, t, F, r, Chi square. Using the data below, show that analyses using each of the three statistics yields the same or similar outcomes.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
The standard for this material requires that impact strength must be greater than 1.0ft-lb/in. The sample average and standard deviation obtained were 1.25 and 0.25 respectively.
What is the probability that a consumer selected at random purchased the same number or more products than before?
13% red, 14% yellow, 16% green, 20% orange, and 24% blue. In a random sample of 12 M & M's what is the probability of having 2 of each color?
The population mean is greater than 200 and the sample mean is 215, we can say that the claim is true even without a formal test. I this true or false and why?
Suppose a worker needs to process 400 items. The time to process each item is exponentially distributed with a mean of 2 minutes, and the processing times are independent.
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