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Can I get a Z-score?
Find the Mean & Median
Standard Deviations
Math Theory?
N(100,15)
100
The z-score used to calculate the 90th percentile is... a. 3.32 b. -1.28 c. 1.28 d. 2.13
c. 1.28
100
Find the mean of this data. 12 14 745 46 5 7 76 46 35
Mean=109.55556
100
Calculate the standard deviation for this set of data: 51 12 56 85 48 52 68 42 35 85 87 73
22.79088
100
The mean for actual observed data is ... a) x-bar b) x c) sigma d) mu
a) x-bar.
100
The most likely distribution the title of this category suggests is a)Weights of adult males in lbs b)SAT math scores c)IQ scores d)heights of women in meters
What is c
200
Each year, a national achievement test is administered to 3rd graders. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test? (A) 82 (B) 88 (C) 100 (D) 112 (E) 118
E.
200
Find the mean of the Standard Normal Distribution
What is 0
200
Calculate the standard deviation for this set of data. 654 357 915 543 253 543 951 841 875
253.36655
200
The mean of a population is called this... a. x b. x-bar c. mu
What is Mu.
200
This is the percentage of observations between 100 and 130
What is 47.7%
300
A z-score is...
A standardization of a number.
300
Frank's test score of 94 is two standard deviations above the mean. If the standard deviation is 12, then the mean is...
What is 70
300
You took the SAT and scored a 520 in Math. The national mean Math section SAT score is 480. The standard deviation is 7. Approximately how many standard deviations from the mean did you score?
What is 6. (5.7 rounded up)
300
The area under a ______ _____ is equal to 1. a. symmetric curve b. normal approximation c. density curve
c. density curve
300
This is the Percentage of scores below 130
What is 97.7%.
400
This z score corresponds to the third quartile
What is z = .67
400
On a right-skewed distribution, the mean is ___ the median a)Greater than b)Less than c)equal to d)more info needed
What is a
400
If you make $7.25 per hour at a place where the mean wage is $10.50, and the standard deviation is equal to $1.20, how many standard deviations away from the mean is your hourly wage?
2.7 standard deviations.
400
___ percent of observations in a normal distribution fall within 2.576 standard deviations of the mean
What is 99%
400
This is the 70th percentile rounded to the nearest whole number
what is 108
500
Every year, 50,000 runners compete in the Peachtree Road Race. They run 10 kilometers (a little over 6 miles). The average finishing time is 55 minutes, with a standard deviation of 10 minutes. Fred and Wilma completed the race in 61 and 51 minutes, respectively. Barney and Betty had finishing times with z-scores of -0.3 and 0.7, respectively. List the runners in order, starting with the fastest runner and ending with the slowest runner. (A) Wilma, Barney, Fred, Betty (B) Barney, Wilma, Fred, Betty (C) Wilman, Barney, Betty, Fred (D) Betty, Fred, Barney, Wilma (E) None of the above
A
500
In a ______ distribution, the mean is less than the median
What is left skewed
500
The mean salary for basketball players in the NBA in 2000 was 2.1 million, with a standard deviation of 1.2 million. If your salary as an NBA player, in the same year, was 5.7 million, how many standard deviations away from the mean was your salary?
3 standard deviations.
500
On a normal distribution, ___%, ___%, and ___% of the distribution falls within one, two and three standard deviations of the mean respectively
what are 68, 95 and 99.7
500
This is the interquartile range, rounded to the nearest whole number
What is 110-90 = 20