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The data shown represent the scores on a national achievement test for a group of 10th grade students.
Find the approximate percentile ranks of these scores by constructing a percentile graph (Ogive).
Use the Ogive, estimate percentile of a student who scored 200 points in the test? What is the student
score must be in order in the 90 percentile?
Score
classes
Freq. Score
upper
limit
Cumulative
Freq.
Relative
< 196.5 0 < 196.5
196.5 – 217.5 5 < 217.5
217.5 – 238.5 17 < 238.5
238.5 – 259.5 22 < 259.5
259.5 – 280.5 48 < 280.5
280.5 – 301.5 22 < 301.5
301.5 – 322.5 6 < 322.5
Total 120
The length of time to do a complete full service oil change at Speedy-Lube is normally distributed with a mean of 15.8 minutes and a standard deviation of 2.2 minutes
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Construct a 95% confidence interval estimate for the population proportion of adults who report that e-mails are easy to misinterpret.
In testing equality of two means below, determine the test statistic? (Use the equal variances formula)
How many independent network servers would be needed if each has 99 percent reliability? (b) If each has 90 percent reliability?
Find probability using normal distribution.Using N (1152, 84), the Normal model for weight of Angus steers, what percent of steers weigh.
Trevor is interested in purchasing the local hardware/sporting goods in the small town of Dove creek, Montana. After examing accounting records for the past several years
Use the least squares method to find the regression coefficients b0 and b1. State the simple linear regression equation.
Mean income of $30,000and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?
Two t-curves have degrees of freedom 12 and 20, respectively. Which one more closely resembles the standard normal curve? Explain your answer.
If a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.0 and 53.0 minutes what is the probability that a given class period runs greater than 51.25 minutes.
For the 20 test scores shown, find the percentile rank for a score of 86.
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