863 Answered Questions for the topic Statistics Question

WHAT HYPOTHESIS TEST TO USE WITH NON-NUMERIC DATA?

I have a question and I'm being asked to specify which test to use and then conduct it. However, the data given is non-numeric. the question statement is "males and females differ in whether or not... more
Statistics Question

11/18/17

Find the probability and interpret the results.

Find the probability and interpret the results.The population mean annual salary for environmental compliance specialists is about $60,000. A random sample of 40 specialists is drawn from this... more
Statistics Question

11/18/17

Find the indicated probability using the standard normal distribution. ​P(0<z<0.525​)?

Find the indicated probability using the standard normal distribution. P(0<z<0.525)?  
Statistics Question

11/18/17

Find the​ z-scores for which 3​% of the​ distribution's area lies between −z and z.?

Find the z-scores for which 3% of the distribution's area lies between −z and z.?  
Statistics Question Statistics

11/18/17

victims recently exposed to radiation are 5.5, 6.2, and 4.8. Based on this observed data a 95% Confidence Interval for μ computed to two decimal places is

Post-exposure radiation levels are approximately Normally distributed with mean μ. The levels (in Sv) of a random sample of three trauma victims who were recently exposed to radiation are 5.5, 6.2,... more
Statistics Question Math Statistics

11/18/17

How to set up this stats problem

What is the probability a random sample of size 20 will have a mean gestation period within 11 days of the mean? σ=13 μ=197
Statistics Question

11/15/17

The probability that an individual has 20-20 vision is 0.1 in a class of 77 students, what is the probability of finding five people with 20-20 vison

I need help answering this question.  A)0.065 B)0.000 C)0.1 D)0.100
Statistics Question Statistics College Math

11/12/17

scores on a SAT - statistics

Scores on a SAT form a normal distribution of µ = 500 and σ = 100   1) What is the minimum score necessary to be in the top 20% of the SAT distribution?   2) find the range of value that... more
Statistics Question Binomial Math Problem

11/12/17

Binomial stats problem help

A poll reported that 63% of adults were satisfied with the job the major airlines were doing. Suppose 15 adults are selected at random and the number who are satisfied is recorded.-Would it be... more

11/10/17

been stuck with this stats problem for an Hour!!

Top sales executives, Alissa and Emilia came up with kiwi passion fruit cookie company. The machine fills each package cookies so that they have an average weight of 32 ounces with a variance of... more
Statistics Question Null Hypothesis Testing

11/10/17

Hypothesis testing

Alondra , Lídia Co creators of quiadas inc claim that their facial blend will keep woman’s skin and healthy for at least 65 days. Alex ,advocate tested 15 bottles and found a mean of 63 days with a... more
Statistics Question Probability

11/09/17

52% of voters voted for Barack Obama. If a sample of 100 voters were polled, would it be unusual if less than 40% of them had voted for Barack Obama

I've been trying to remember how to solve this but I can't find it in my notes please help
Statistics Question Statistics

11/08/17

a fashion designer wants to know how many new dresses women buy each year. Suppose a sample of 849 is drawn with x= 5.3. Assume standard deviation = 1.5.

construct 98% confidence interval. lower and upper bounderies needed
Statistics Question

11/07/17

For population, N = 11,000, mu =139, standard deviation = 15, find z value for x =128.60 for n= 64

mu = µ, standard dev = σ
Statistics Question Statistics Percentages

11/05/17

Statistics question.

I'm having a bit of trouble with this question. So I know that I need to find the z-score, but after that i'm not sure how to fer the exact percentage? I know the formulas for the z-score and... more
Statistics Question

11/05/17

PROBABILITY

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 54.0 minutes. Find the probability that a given class period runs... more
Statistics Question

11/02/17

50 students take an iq test, which has a mean of 100 and a standard deviation of 10. What would a student need to score to be in the top 95 percentile

minimum score in the top 5 percent  maximum score and still in bottom 25 percent
Statistics Question

10/29/17

Find the margin of error for the given confidence level and values of x and n. x=111,n=194, confidence level 99%

I have no clue on how to solve.  Please help
Statistics Question Statistics

10/22/17

How to find a percentage with a normal distribution

The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. Eighty percent of the time, it takes more... more
Statistics Question

10/15/17

QUESTION IS IN THE DESCRIPTION (ENTER ANSWER AS WHOLE NUMBER)

Assume you have a room of 10 Facebook users and the average number of friends is 130. If one person in this room adds 50 new Facebook friends (none of whom are in the room), then what would be the... more
Statistics Question

10/15/17

The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%.

The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%. If the distribution is unimodal and symmetric with no outliers, what can we say about the... more
Statistics Question

10/15/17

It's statistics and probability related question.

a) A survey of park showed an average expenditure of Rs. 10.30. If for 20 girls the average expenditure was Rs.9.70 and Rs. 11.1 for the boys. Find the number of boys.b) A computer calculated a... more
Statistics Question

10/13/17

the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5

the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5
Statistics Question Statistics

10/11/17

Statistics question, please help asap?

The time to complete a standardized exam is approximately normal distributed with a mean of 100 minutes and a standard deviation of 15 minutes. The time, to the nearest minute, that should be given... more
Statistics Question Statistics

10/11/17

please help thanks!!

The results of an examination are found to be normally distributed with a standard deviation of 15.0. If a student is selected at random, the probability is 0.0485 that his mark will exceed 85. The... more

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