275 Answered Questions for the topic Stats

03/29/18

Find the value of the test statistic
I would really appreciate the help guys. Thanks again !   1)the claim is that the proportion of peas with yellow pods is equal to 0.25 the sample statistics from one experiment include 560 peas... more
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Stats

03/02/18

if you have the numbers 1,1,2,3,4,6,8, how many odd numbers over 5,000,000 can you make?
Stats question, i thought it was 120 because there would only be 2 ways to make an odd number but some people told me that since there are 2 ones then it would be x3 at the end to make 180. i think... more
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Stats

02/06/18

Suppose we are interested in tossing two fair die and adding the sum of the roll
A. What are the possible outcomes?     B. What are the possible values for x? (x= the sum is a prime number)    
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02/01/18

Stats Hw Question
The authors of the paper "Fudging the Numbers: Distributing Chocolate Influences Student Evaluations of an Undergraduate Course"† carried out a study to see if events unrelated to an undergraduate... more
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01/10/18

How many students would you expect to wait more than 18.5 minutes?
200 senior high students were asked how long they had to wait in the cafeteria line for lunch. Their responses were found to be normally distributed, with a mean of 15 minutes and a standard... more
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Stats

01/05/18

What proportion of exam scores are lower than Irina's score?
A set of physics exam scores are normally distributed with a mean of 80 points and a standard deviation of 6 points. Irina got a score of 95 points on the exam.
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Stats

12/20/17

Construct a data set consisting of 10 numbers, all but one which is above average, where the average is the mean
Construct a data set consisting of 10 numbers, all but one which is above average, where the average is the mean....  also is it possible to construct a data set  when the average is the median?... more
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Stats

12/12/17

A body temperature of 99.5° F given that human body temperatures have a mean of 98.20° F and a standard deviation of 0.62°.
Find the z-score corresponding to the given value and use the z-score to determine whether the value is unusual. Consider a score to be unusual if its z-score is less than -2.00 or greater than... more
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Stats

12/03/17

if the mean is 60, the median is 65 and the mode is 70 what type of skewness is the distribution
types of distribution in statistics
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Stats

11/23/17

Statistics Help
A survey found that women's heights are normally distributed with mean 62.8 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with mean 69.9 in.... more
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Stats

11/13/17

Rex’s Flower Shop advertised freshly cut roses that last longer than other roses.
The mean vase life for a rose is 8 days. The following is a sample of the vase life of 9 bouquets of roses from Rex’s Flower Shop: 8, 6, 12, 11, 8, 9, 14, 15, 10. Complete the following:a. State... more
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Stats

11/09/17

College stat
Police response time to an emergency call is the difference between the time the call is first received by the dispatcher and the time a patrol car radios that it has arrived at the scene. Over a... more
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Stats

10/16/17

find the mean of the scores on an exam if a grade of 70 corresponds to a Z score of -.6 when the standard deviation is 3
Please help me answer and find the mean
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Stats Probability

10/10/17

(a) There are 33 students in this class. How many ways are there to split the class into two groups that are as balanced as possible?
Combination or permutation
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Stats

10/05/17

Expected value and variance
Let Y be a random variable with p(y) given in the accompanying table. Find E[Y ],E[1/Y ], E(Y2 -1), V(Y) y 1 2 3 4p(y) 0.4 0.3 0.2 0.1   I know that V(Y) means the variance but what does E(1/Y)... more
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10/01/17

how do I solve this?
74 566 681 852 1173 1262 1552 1645 1762 1846 1860 1946 2038 20y=31.934+(-0.304)x An ecologist uses the line, based on 13 colonies, to predict how many new birds will join another colony, to which... more
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Stats

09/28/17

Weight is known to have a normal distribution. Answer the following questions:
Weight is known to have a normal distribution. Answer thefollowing questions:- how many newborns had a weight < 3 750 g?- how many newborns had a weight > 4 330 g?- how many newborns had a... more
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Stats

09/27/17

mean weight of 800 people is 93kg and standard deviation of 4kg. how many people weigh under 89kg?
the answer given is 128, but how do they get to this?
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09/24/17

(a) What percent of the runners have heart rates above 143? (b) What percent of the nonrunners have heart rates above 143?
In a study of exercise, a large group of male runners walk on a treadmill for 6 minutes. Their heart rates in beats per minute at the end vary from runner to runner according to the N(106,... more
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09/23/17

(a) The point z with 65% of the observations falling below it (b) The point z with 25% of the observations falling above it
Use Table A to find the value z of a standard Normal variable that satisfies each of the following conditions. (Use the value of z from Table A that comes closest to satisfying the condition.) In... more
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09/23/17

What percent of adults would qualify for membership? (Enter your answer to one decimal place.)
The scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 13. An organization requires an IQ score of 126 or higher for membership. 
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Stats Statistics

09/20/17

There are four cards with 2 aces and 2 kings in a box. If a person randomly selects 2 cards, find the chance to get a pair.
find the probability to get a pair
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09/17/17

can someone explain how to get the percentage?
Scores on the Wechsler Adult Intelligence Scale (WAIS) are approximately Normal with mean 97 and standard deviation 14. People with WAIS scores below 69 are considered intellectually disabled when,... more
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09/17/17

can someone explain how to get the percentage?
The scores of adults on an IQ test are approximately Normal with mean 110 and standard deviation 17. An organization requires an IQ score of 144 or higher for membership. What percent of adults... more
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09/16/17

What percent of women over 20 have upper arm lengths less than 32.9 cm?
The upper arm length of females over 20 years old in a country is approximately Normal with mean 35.1 centimeters (cm) and standard deviation 2.2 cm. Use the 68-95-99.7 rule.
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