1. An article in USA Today stated that "Internal surveys paid for by directory assistance providers show that even the most accurate companies give out wrong numbers 15% of the time." Assume that you are testing such a provider by making 10 requests and also assume that the provider gives the wrong telephone number 15% of the time. Find the probability of getting at most, one wrong number. (Assume the Binomial distribution applies.)

0.347
0.544
0.653
0.456

2. Comparing Scores. Three students take equivalent tests of a sense of humor and, after the laughter dies down, their scores are calculated. Which is the lowest relative score?
1. A score of 144 on a test with a mean of 128 and a standard deviation of 34?
2. A score of 90 on a test with a mean of 86 and a standard deviation of 18?
3. A score of 18 on a test with a mean of 15 and a standard deviation of 5?

Answer 1.
Answer 2.
Answer 3.
Cannot determine from the information provided.

3. Comparing a z Score. Heights of women have a mean of 63.6 inches and a standard deviation of 2.5 inches. Julia Roberts, who is one of the most successful actresses in recent years, has a height that converts to a z score of 2.16. How tall (in inches) is Julie Roberts?

69 inches.
59 inches.
Can not convert z scores to inches, impossible to answer the question.
A sample size is not given; accordingly the standard error of the mean can not be calculated; impossible to answer the question.

Comparing Scores. 3 students take equivalent test of a sense of humor and, after the laughter dies down, their scores are calculated which score is in the middle of the other two?
1. A score of 144 on a test with a mean of 128 and a standard deviation of 34?
2. A score of 90 on a test with a mean of 86 and a standard de

Two Psychology majors, in 2 different sections of Clinical Psychology, were comparing test scores. The following gives the students' scores, class mean, and standard deviation for each section:
Section 1 Section 2
Score 84 75
Mean 75 60
Standard deviation

Setting ยต = 60 and σ = 7
What is the z score of 78?
What is the z score of 45?
What is the probability of 59?
What is the probability of 62?
What score falls at z = 1.64?
What score falls at z = -1.96?
What percentage of scores are 73 or less?
What proportion of scores is between 45 and 78?

Help with this problem please:
Jane is told that her GMAT score is in the top 2% in her region at 28. The average score was 18. Tom scores 25 and Sandra scores 17. What are Jane, Tom, and Sandra's percentile scores?

How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test?
Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
How do these standardized scores help researchers to compare the scores on two different tests with different me

For a population with a mean of 60 and a standard deviation of 24, find the z-score corresponding to each of the following samples.
a. M = 63 for a sample of n = 16 scores
b. M = 63 for a sample of n = 36 scores
c. M = 63 for a sample of n = 64 scores
A population of scores forms a normal distribution with a mean of 40

A test has a mean of 30, a standard deviation of 6, and scores that are normally distributed. Of the 50 people who took the test, about how many people would be expected to score between 24 and 36?
A. 25 people
B. 34 people
C. 47 people
D. There is not enough information to tell

Scores on an assessment exam at a private school are normally distributed, with a mean of 72 and a standard deviation of 8. Any student who scores in the top 5% is eligible for a scholarship. What is the lowest whole number score you can earn and still be eligible for a scholarship?

Comparing Scores. 3 students take equivalent test of a sense of humor and, after the laughter dies down, their scores are calculated which is the highest relative score?
1. A score of 144 on a test with a mean of 128 and a standard deviation of 34?
2. A score of 90 on a test with a mean of 86 and a standard deviation of