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Statistics

04/06/23

What is a real-world example of a t-test

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Statistics

04/05/23

Statistics word problem

The ages of a group of 123 randomly selected adult females have a standard deviation of 17.1 years. Assume that the ages of female statistics students have less variation than ages of females in... more

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Statistics

04/05/23

Statistics Word Problem

Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t a/2, (b) find the critical value z a/2, or (c) state that... more

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Statistics

04/04/23

What is the probability that two randomly selected returns with income of $100,000 or more will be audited?

For the fiscal year 2007, a tax authority audited 1.52% of individual tax returns with income of $100,000 or more. Suppose this percentage stays the same for the current tax year.

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Statistics Math

04/02/23

A fair coin is flipped six times. What is the probability that heads occurs exactly 3 times if it is known that heads occurs at least three times?

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Statistics

04/01/23

statistics and probability

Suppose that an anxiety measure has a mean of 115 and variance of 256. The researcher only wants to work with 19% of the upper participants. What is the smallest average score the researcher should... more

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Statistics

04/01/23

How do I solve the question below?

Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested.... more

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Statistics

03/31/23

Stats help please

Assume that a sample is used to estimate a population portion P find a 99% confidence interval for a sample of size 286 with 39% successes. Enter your answer as a try linear inequality using... more

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Statistics

03/29/23

A grocery store sells apples in bags that are claimed to have a mean weight of 3 lbs. The Department of Weights and Measures tests 100 randomly selected bags and finds a mean weight of 2.8 lbs.

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Statistics

03/29/23

If your null and alternative hypothesis are: H 0 : μ = 23 H 1 : μ ≠ 23 . Is it right tailed, left tailed, or two tailed?

#5

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Statistics

03/29/23

Testing: H 0 : μ = 15.7 H 1 : μ < 15.7 Your sample consists of 35 subjects, with a mean of 14.7 and standard deviation of 3.36. Calculate the test statistic rounded to 2 decimal places.

#4

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Statistics

03/29/23

Suppose are running a study/poll about the probability of a true negative on a test for a certain cancer. You randomly sample 93 people and find that 63 of them match the condition you are testing.

#3

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Statistics

03/29/23

The mean weight of female dancers in a local modern dance company is at most 146 lbs. Express the null and alternative hypotheses in symbolic form for this claim.

#2

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Statistics

03/29/23

At least 20% of people support the death penalty. Express the null and alternative hypotheses in symbolic form for this claim (enter as a decimal).

#1

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Statistics

03/29/23

Express the confidence interval 12.6%<p<24.4% 12.6 % < p < 24.4 % in the form of ˆ p ±ME ˆ p ± M E .

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Statistics

03/29/23

Express the confidence interval 52.3 % ± 3.9 % in interval form.

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Statistics

03/29/23

Assume that a sample is used to estimate a population proportion p. Find the margin of error (E) that corresponds to a sample of size 123 with 25 successes at a confidence level of 98%.

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Statistics

03/29/23

If n=500 and ˆ p (p-hat) =0.49, find the margin of error at a 99% confidence level.

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Statistics Probability

03/29/23

What is the median IQ score for this sample?

Q scores are collected from a sample of students at a large university. The scores are shown below.99, 100, 105, 104, 102, 105, 105, 121, 104What is the median IQ score for this... more

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Statistics Probability

03/29/23

Please help me to answer this question? Which one would be the right conclusion?

The distribution of the salaries at a small business is strongly skewed with many people making very modest salaries and a few making very large salaries. Which measure of center, mean or median,... more

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Statistics

03/29/23

stats 1000 sampling distribution of sample proportion

Suppose that 10% of the population of college students is left-handed. A classroom hasbeen built with 15 “lefty seats” (e.g. seats that have the built-in desk on the left rather than theright).(a)... more

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Statistics

03/28/23

Statistics Questions

The probability density of a random variable X is given in the figure below.From this density, the probability that X is between 0.62 and 1.52 is:

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Statistics Electrical Engineering

03/28/23

The question is in the description. It is a statistics question that involves normal distribution

You are given the following random sample from a population that you believe to be approximately normally distributed. 8.60 8.70 9.00 8.97 8.72 8.74 8.96 8.78 a. What is a 95% confidence interval... more

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Statistics

03/27/23

with a mean of 19.6 inches, and standard deviation of 3.2 inches. If 47 items are chosen at random, what is the probability that their mean length is greater than 20.8 inches?

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Statistics Probability

03/27/23

please help me solve this

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 99% confident that your... more

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What is a real-world example of a t-test

Statistics word problem

Statistics Word Problem

What is the probability that two randomly selected returns with income of​ $100,000 or more will be​ audited?

A fair coin is flipped six times. What is the probability that heads occurs exactly 3 times if it is known that heads occurs at least three times?

statistics and probability

How do I solve the question below?

Stats help please

A grocery store sells apples in bags that are claimed to have a mean weight of 3 lbs. The Department of Weights and Measures tests 100 randomly selected bags and finds a mean weight of 2.8 lbs.

If your null and alternative hypothesis are: H 0 : μ = 23 H 1 : μ ≠ 23 . Is it right tailed, left tailed, or two tailed?

Testing: H 0 : μ = 15.7 H 1 : μ < 15.7 Your sample consists of 35 subjects, with a mean of 14.7 and standard deviation of 3.36. Calculate the test statistic rounded to 2 decimal places.

Suppose are running a study/poll about the probability of a true negative on a test for a certain cancer. You randomly sample 93 people and find that 63 of them match the condition you are testing.

The mean weight of female dancers in a local modern dance company is at most 146 lbs. Express the null and alternative hypotheses in symbolic form for this claim.

At least 20% of people support the death penalty. Express the null and alternative hypotheses in symbolic form for this claim (enter as a decimal).

Express the confidence interval 12.6%<p<24.4% 12.6 % < p < 24.4 % in the form of ˆ p ±ME ˆ p ± M E .

Express the confidence interval 52.3 % ± 3.9 % in interval form.

Assume that a sample is used to estimate a population proportion p. Find the margin of error (E) that corresponds to a sample of size 123 with 25 successes at a confidence level of 98%.

If n=500 and ˆ p (p-hat) =0.49, find the margin of error at a 99% confidence level.

What is the median IQ score for this sample?

Please help me to answer this question? Which one would be the right conclusion?

stats 1000 sampling distribution of sample proportion

Statistics Questions

The question is in the description. It is a statistics question that involves normal distribution

with a mean of 19.6 inches, and standard deviation of 3.2 inches. If 47 items are chosen at random, what is the probability that their mean length is greater than 20.8 inches?

please help me solve this

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What is the probability that two randomly selected returns with income of $100,000 or more will be audited?