8,943 Answered Questions for the topic statistics

Statistics

04/22/23

We compare two sample variances to determine whether the difference between them is probably not due to random sampling error when we perform a ______.
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Statistics

04/22/23

statistics help

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.1 years, and standard deviation of 2.5 years.If you randomly purchase one item, what is the probability... more
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Statistics

04/21/23

Probabilities with patients
In studies linking obesity to Non-Insulin Dependent Diabetes (NIDD) it is thought that obesity genes interact with diabetes susceptibility genes. In industrialized countries 30% of the population... more
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Statistics

04/21/23

what are the frequency, test statistic, and critical value?
You are conducting a Goodness of Fit hypothesis test for the claim that the 4 categories occur with the following frequencies: H0 : Pa=0.25;  Pb=0.25;  Pc=0.4;  Pd=0.1 Give all answers as decimals... more
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Statistics

04/21/23

For the situation described below, state the null hypothesis, H0, and the alternative hypothesis, Ha, to be tested. (Enter != for ≠ as needed.)
A statistical test is designed to show that the mean 𝜇 is different from 150.
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Statistics Probability

04/20/23

What is the probability that the geyser will erupt in the next hour?
Suppose that the number of minutes between eruptions for a certain geyser can be modeled by the exponential distribution and that the mean time between eruptions is 72 minutes. What is the... more
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Statistics

04/19/23

statistics question

You intend to estimate a population mean μμ with the following sample. 42.1 48.1 54.2 65.1 46.7 50.9 29.6 46.6 48 31.9 40 35.3 You believe the population is normally distributed. Find the 80%... more
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Statistics

04/19/23

statistics question
Out of 400 people sampled, 284 had kids. Based on this, construct a 95% confidence interval for the true population proportion of people with kids.Give your answers as decimals, to three places
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Statistics

04/19/23

A confidence interval for a population mean has length 22. a) Determine the margin of error. b) If the sample mean is 63.1, obtain the confidence interval. Confidence interval: ( , ).
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Statistics

04/19/23

Suppose you calculate a 99% confidence interval of 13.01 to 21.4. Determine the margin of erro
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Statistics

04/19/23

Normally distributed height

The heights of 18 year-old men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches.(a) If a random sample of sixteen 18-year-old men is selected, what is the... more
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Statistics Probability

04/19/23

Statistic and Probability
Jhude has 6 Algebra books and 4 Statistic books. He only has a space for 5 books on the shelf. If the first 3 slots are to be occupied by Statistics books and the remaining slots by the Algebra... more
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Statistics

04/18/23

What is the n = to in the probability distribution

Probability Distribution - A study conducted by three law school professors found that asylum seekers in the US face broad disparities in the nation's immigration courts. The professors discovered... more
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Statistics

04/18/23

normal distribution

Assume that x has a normal distribution. Find P(3 ≤ x ≤ 6) given that 𝜇 = 4.7 and 𝜎 = 1.6. (Use 4 decimal places.)
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Statistics

04/18/23

Which of the following is not an effect of adding a constant, b, to each value in a data set?
Which of the following is not an effect of adding a constant, b, to each value in a data set? Select an answer that best applies and why. A. It is added to measures of center and location B. It... more
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Statistics

04/17/23

find the sample size
Given a normal distribution with 𝜎 = 1.790. Find the required sample size for a 90% confidence level (estimating the mean) with a 1.02 margin-of-error.
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Statistics

04/17/23

AP Statistics help?
Mrs. Chavis's statistics class has 26 students in it, 14 girls and 12 boys.She uses a calculator to select two students at random to solve a problem on the board.(a) What is the probability that... more
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Statistics

04/17/23

AP Statistics help?
On Mr. Casper's debate team at Thunderbird High School, 20% of the members are Sophomores, 35% are Juniors and 45% are Seniors.A team member is selected randomly to give the closing argument for... more
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Statistics

04/16/23

Statistics help
A coin is flipped 64 times. The number of heads observed over all the coin flips is a binomial random variable whose distribution is roughly normal. Use the normal approximation to compute the... more
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Statistics

04/16/23

Statistics help

the average income of a certain town is $30,000 with a standard deviation of $4000. What is the probability a sample size of 16 has a sample mean between $28,000 and $32,000?
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Statistics

04/14/23

How do I answer this question properly ?
In a recent Super Bowl, a TV network predicted that 31 % of the audience would express an interest in seeing one of its forthcoming television shows. The network ran commercials for these shows... more
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Statistics

04/14/23

Test statistic for college student

Testing:H0:p=0.3H1:p<0.3Your sample consists of 131 subjects, with 36 successes. Calculate the test statistic, rounded to 2 decimal places
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Statistics Math

04/12/23

Sampling Distributions
A student running for a position in student government believes that 55% of the student body will vote for her. However, she is worried about low voter turnout. n = 200. Complete parts a through d... more
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Statistics

04/12/23

Construct a 98% confidence interval for the true proportion of adults that are worried about being "hired by a robot." (Round your answer to three decimal places.)

Will there be a time when hiring decisions will be done using a computer algorithm, and without any human involvement? A survey found that 60% of the adults surveyed were worried about the... more
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Statistics

04/12/23

A 90% confidence interval for p, based on a random sample of n = 400 observations from a binomial population with x = 375 successes.
Find the necessary confidence interval for the binomial proportion p. (Round your answers to three decimal places.)
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