8,958 Answered Questions for the topic statistics

Statistics

02/22/23

probability songs
Charles has three songs on a playlist. Each song is by a different artist. The artists are Joey McIntyre, Jennifer Lopez, and Elvis Presley. He programs his player to play the songs in a random... more
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Statistics

02/22/23

Probability dice roll
A fair 6-sided die is rolled three times. What is the probability that all three rolls are 1? Write your answer as a fraction or a decimal, rounded to four decimal places.
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Statistics

02/22/23

Mean =792, sd=60, find highest 15% of population using z-test.
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Statistics

02/22/23

company wants to test the claim that their batteries last more than 40 hours. random sample of 15 batteries yielded a mean of 44.9 hours, with a standard deviation of 8.9 hours. alpha 0.05.
i calculated the t-test and it's 2.13. Can someone explain the following and how we got 0.026? p-value = P(tdf=14 > 2.13) = 0.026because p=0.026 <alpha=0.05 reject H0
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Statistics

02/22/23

Mean and standard deviation help.

A professor knows from past experience that the time for students to complete a quiz is normally distributed with mean 26 minutes and standard deviation 3 minutes.(a) If the teacher... more
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Statistics Biostatistics

02/20/23

a particular fruit...
A particular fruit's weights are normally distributed, with a mean of 425 grams and a standard deviation of 6 grams.If you pick 10 fruit at random, what is the probability that their mean weight... more
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Statistics

02/20/23

What percentage of times are between 6 and 22 hour
The graph shows the distribution of times (in hours) that teenagers spend playing video games per week. The distribution is approximately Normal, with a mean of 14 hours and a standard deviation of... more
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Statistics

02/20/23

Statistics question

Calculate the Mean, Median,Mode, and Range. Round to two decimal places when never. Show work for full credit. 4,15,3,8,4,7,15,5,17
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Statistics

02/20/23

Statistics question

Calculate the Mean, Median,Mode, and Range. Round to two decimal places when never. Show work for full credit
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Statistics Biostatistics

02/20/23

A particular fruit's weights are normally distributed...
A particular fruit's weights are normally distributed, with a mean of 224 grams and a standard deviation of 16 grams. If you pick 11 fruit at random, what is the probability that their mean weight... more
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Statistics

02/19/23

Probability question
When doing blood testing for a viral infection, the procedure can be made more efficient and less expensive by combining partial samples of different blood specimens. If samples from four people... more
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Statistics

02/19/23

normally distributed lifespan, with a mean of 7.1 years, and standard deviation of 0.5 years. The 4% of items with the shortest lifespan will last less than how many years?
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Statistics

02/19/23

What is the probability a sample of 90 test takers; a sample mean test score greater than 540 on the evidence based reading and writing 533; Mathematics 527 writing part of the test?

What is the probability a sample of 90 test takers will provide a sample mean test score greater than 540 on the evidence based reading and writing part of the test? Evidence Based Reading and... more
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Statistics

02/18/23

AP Statistics (Highschool), Probability Percentage
In an effort to cut costs and improve profits, any US companies have been turning to outsourcing. In fact, according to Purchasing magazine, 54% of companies surveyed outsourced some part of their... more
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Statistics

02/17/23

find the sample size
You are interested in estimating the the mean weight of the local adult population of female white-tailed deer (doe). From past data, you estimate that the standard deviation of all adult female... more
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Statistics

02/16/23

Find the probability

The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.3 minutes and a standard deviation of 3.5 minutes. Assume that the distribution of taxi and takeoff times is... more
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Statistics

02/15/23

Find the probabilities

(a) Assume that IQ scores are normally distributed, with a standard deviation of 15 points and a mean of 100 points. If 70 people are chosen at random, what is the probability that the sample mean... more
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Statistics

02/15/23

statistics questions

A professors classes has a continuous uniform distribution between 50.0 min and 52.0 min. If one such class is randomly selected, find the probability that the class length is less than 51.3... more
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Statistics

02/14/23

If P(B) = 0.05, P(A|B) = 0.80, P(B′) = 0.95, and P(A|B′) = 0.40, find P(B|A). Be careful P(B') is not equal to 0.95; you can compute P(B') by yourself using the other info in the problem.
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Statistics Probability

02/13/23

z scores / probability / stats
assume that the scores are normally distributed with a mean of zero and a standard deviation of one. A) if p(z<a) = .9599, find a. B) if P(z>b) = .9772, find b. C) if P(z>c) = .0668, find c
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Statistics Probability

02/13/23

statistics probability
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.A) A person is considered intellectually very superior if his or her IQ score exceeds 132, what percentage of... more
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Statistics Probability

02/13/23

in description .
assume that human body temperatures are normally distributed with a population mean of 98.6 in standard deviation of .62°F. The city hospital uses 100.4°F as the lowest temperature considered to be... more
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Statistics

02/12/23

Best odds to win a slot tournament....
Slot tournament 16 players , 1 on 1 elimination style, winner take all. If 2 of us are going to play, we have the option to both play in the same tournament or each play in a separate tournament.... more
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Statistics Probability

02/12/23

Statistics and probability

How many different four-letter passwords can be created for a software access if no letter can be used more than once?
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Statistics

02/11/23

applied reseach
1. A researcher found that the length of time for five-person student groups to reach a consensus on a sexual harassment policy at the University of Ghana has a normal distribution with mean = 2.2... more
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