unit 1 test review

January 16, 2018 | Author: Anonymous | Category: Math, Statistics And Probability, Statistics
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Scores on the math section of the SAT are normally distributed with a mean of 650 and a standard deviation of 50. What percentage of the math scores are between 500 - 800?  99.7% 

Weight is normally distributed with a mean of 100 lbs and a standard deviation of 15. What percentage of people fall between 70 - 100?  47.75% 

Scores on the Social Studies section of the GHSGT are normally distributed with a mean of 210 and a standard deviation of 20. What is the percent of social studies scores that fall between 190 - 270?  84% 

Soccer goals by year are normally distributed with a mean of 55 and a standard deviation of 3. Find the z-score for 50.  -1.67 

Juan’s grades are normally distributed with a mean of 78 with a standard deviation of 5. What is the z-score for 85?  1.40 

The temperatures for September are normally distributed with a mean of 94º and standard deviation of 2º. What is the z-score for 91º?  -1.50 

Snowfall in January is normally distributed with a mean of 4.5” and a standard deviation of .5”. What percent of the data is below 5.1”?  88.49% 

Love Poems in Mr. Kirkpatrick’s mailbox average 7 per day with a standard deviation of 2. What percent of the data is more than 9?  15.87% 

Find the percent that gives the following z-score: 1.57  94.18% 

Find the percent that gives the following z-score: -.42  33.72% 

Find the z-score that is closest to having the exact percentage of 56%  .15 

Find the z-score that is closest to having the exact percentage of 21%  -.81 

What are the two z-scores that contain middle 30% of the data?  -.39, .39 

What are the two z-scores that contain middle 80% of the data?  -1.28, 1.28 

Gas mileage for a Toyota Prius is 44 mpg with a standard deviation of 3. The middle 60% of these cars have a mileage between _____ and _____.  41.5, 46.5 

Gas mileage for a Toyota Tacoma is 21 mpg with a standard deviation of 2. The middle 64% of these cars have a mileage between _____ and _____.  19.2, 22.8 

A sample of 64 juniors at Southeast have an average IQ of 76 with a standard deviation of 4. Construct a 95% Confidence level for mean IQ.  75.02, 76.98 

A sample of 30 freshmen at Southeast have an average IQ of 50 with a standard deviation of 3. Construct a 99% Confidence level for mean IQ.  48.59, 51.41 

A recent study was conducted at Southeast High School to examine who was the most loved teacher. Of the 30 students polled, 60% selected Mr. Kirkpatrick. Construct a 95% Confidence Interval for the population percentage for Mr. Kirkpatrick.  42.6%, 77.4% 

A recent study was conducted at Southeast High School to examine who was the most hated teacher. Of the 50 students polled, 85% selected Mr. Appelman. Construct a 99% Confidence Interval for the population percentage for Mr. Appelman.  72.1%, 97.9% 

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