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To conclude the confidence level used to calculate the confidence interval.
Suppose that the population of the scores of all high school seniors who took the SAT math (SATM) test this year follows a normal distribution with standard deviation σ= 100. You read a report that says, "On the basis of the simple random sample of 100 high school seniors that took the SATM test this year, a confidence interval for µ is found to be 512.00 ± 25.76." What was the confidence level used to calculate this confidence interval?
A) 90%
B) 95%
C) 99%
D) 99.9%
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
State the hypotheses for a right-tailed test.
Use the continuity correction and describe the region of normal curve that corresponds to the indicated binomial probability. The probability of more than 50 right answers.
Compute standard error of mean? Compute the margin of error, with 95% confidence.
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
To find out the estimate of between and within treatments.Samples were selected from 3 populations. The data obtained follow.
A fair coin was flipped three times and landed heads three times. What is the probability of a head on the next toss?
Suppose that this is a simple random sample of adult residents of Maine.
A sample of 10 urgent and non-urgent patients was conducted to determine average wait time. The hospital wants to be sure that urgent patients do not wait as long as non-urgent patients. The following hypotheses have been formulated.
If 1 man aged 18-24 is arbitrarily chosen, determine the probability that his serum cholesterol level is between 165 and 200.
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