8,918 Answered Questions for the topic statistics

Statistics Psychology

11/06/23

How to identify the main different types of experiments (e.g., repeated measures versus concurrent versus pretest/posttest)
How to identify the main different types of experiments (e.g., repeated measures versus concurrent versus pretest/posttest)
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Statistics Psychology

11/06/23

What are the main reasons that multivariate designs can get closer to causal claims?
What are the main reasons that multivariate designs can get closer to causal claims?
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Statistics

11/06/23

STATS HELP PLEASE
According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg. Assume that blood pressure is normally distributed.Round the... more
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Statistics

11/06/23

Test Statistic & P-Value
An article in the San Jose Mercury News stated that students in the California state university system take 6 years, on average, to finish their undergraduate degrees. A freshman student believes... more
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Statistics

11/06/23

Test Statistic & P-Value
The proportion of people that own cats is 60%. A veterinarian believes that this proportion is smaller than 60% and surveys 800 people. Test the veterinarian's claim at the ∝ = 0.05 significance... more
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Statistics

11/06/23

How to do this problem on paper

A researcher would like to know if resilience is related to inner strength. A study was conducted with patients who had been diagnosed with a chronic health condition (i.e. heart disease, cancer,... more
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Statistics

11/06/23

Chapter 13 Correlations
A researcher would like to know if resilience is related to inner strength. A study was conducted with patients who had been diagnosed with a chronic health condition (i.e. heart disease, cancer,... more
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Statistics

11/05/23

Statistics Help
A distribution of values is normal with a mean of 240 and a standard deviation of 3.Find the interval containing the middle-most 36% of scores: Enter your answer using interval notation. Example:... more
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Statistics

11/05/23

STATS HELP PLEASE
E is the only one i am struggling with. How can I do it and please make it simple for me to understand. ThanksA dishwasher has a mean lifetime of 15 years with an estimated standard deviation of 3... more
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Statistics

11/05/23

Business statistics

If n=24, x¯(x-bar)=40, and s=8, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal... more
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Statistics Math Probability

11/04/23

STATS HELP PLEASE
I need help with STATS homework please. I tried twice already on A thinking that the random variable was a "random selected night" however it tells me that this is wrong for the answer. I tried... more
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Statistics

11/04/23

Business statistics
If n=27, x¯(x-bar)=34, and s=14, construct a confidence interval at a 99% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal... more
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Statistics

11/04/23

business statistics

Out of 200 people sampled, 136 had kids. Based on this, construct a 99% confidence interval for the true population proportion of people with kids.Give your answers as decimals, to three... more
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Statistics

11/04/23

statistics and probility
Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 90 tons of coal into each car. The actual... more
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Statistics

11/04/23

Stats homework question
A 99% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.29,0.44).a) what is the critical value used for this interval?b) what is the... more
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Statistics

11/03/23

statistics and probability
Assume that � has a normal distribution with the specified mean and standard deviation.Mean=6; standard deviation=1.1Find the cutoff values of the middle 70%. Round your answers to 3 decimal... more
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Statistics

11/03/23

statistics and probability
Assume that X has a normal distribution with the specified mean and standard deviation. mean=6; standard deviation=0.2 Find the 62nd percentile, that is the cutoff value of the bottom 62%. Round... more
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Statistics

11/02/23

When purchasing bulk orders of​ batteries
When purchasing bulk orders of​ batteries, a toy manufacturer uses this acceptance sampling​ plan: Randomly select and test 42 batteries and determine whether each is within specifications. The... more
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Statistics

11/02/23

In a bag of 390 chocolate​ candies..
In a bag of 390 chocolate​ candies, 41 of them are brown. The candy company claims that 13​% of its plain chocolate candies are brown. For the​ following, assume that the claim of 13​% is​ true,... more
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Statistics

11/02/23

Assume that when human resources

Assume that when human resource managers are randomly​ selected, 43​% say job applicants should follow up within two weeks. If 6 human resource managers are randomly​ selected, find the probability... more
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Statistics

11/02/23

What percentage of students from this school earn scores that satisfy the admission requirement? P(X>917)=.....%
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1461 and a standard deviation of 302. The local college includes a minimum score of 917 in... more
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Statistics

11/02/23

business statistics

If n=12, ¯x¯(x-bar)=30, and s=8, construct a confidence interval at a 95% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal... more
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Statistics

11/02/23

business statistics

Out of 100 people sampled, 49 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... more
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Statistics

11/01/23

business statistics

A political candidate has asked you to conduct a poll to determine what percentage of people support her.If the candidate only wants a 4% margin of error at a 90% confidence level, what size of... more
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Statistics

11/01/23

Business statistics

Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 407 drivers and find that 307 claim to always... more
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