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4,132 Answered Questions for the topic statistics

Statistics

5h

Someone help me with another stats question please

You wish to test the following claim (Ha) at a significance level of α=0.001.Ho:p=0.24Ha:p≠0.24You obtain a sample of size n=410 in which there are 76 successful observations. For this test, you... more
Statistics

5h

Someone please help me with this stats question

You wish to test the following claim (Ha) at a significance level of α=0.05.Ho:μ=74.1Ha:μ>74.1You believe the population is normally distributed, but you do not know the standard deviation. You... more
Statistics

21h

Statistics and probability

A dog psychologist is interested in aggressive behaviors before and after a session of dog yoga. The psychologist rated six dogs' level of aggressive behavior before and after yoga. Did the therapy... more
Statistics

21h

Statistics and probabilities

If you are performing a matched pairs t-test and you have a critical value of +/-2.131 for an alpha = .05, how many participants did you recruit?
Statistics Probability

1d

How do I find the probability for this question?

Hi, if someone could help me solve this problem that would be great, thank you"A distribution is given as X ~ U(0, 12)."Find P(x > 9).  (Enter an exact number as an integer, fraction, or decimal.)
Statistics Math Probability

1d

What value of p makes this an evenly matched game of one-on-one, so that both players have an equal chance of winning before the coin is flipped?

Now that LeBron James and Anthony Davis have restored the Los Angeles Lakers to glory with their recent victory in the NBA Finals, suppose they decide to play a game of sudden-death, one-on-one... more
Statistics Math Sat Math

1d

stastitics question

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and... more
Statistics Histograms

1d

hey my teacher gave this for our midterm. i'M SO CONFUSED!!

1) Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found... more

2d

How can I find a margin of error when the only information given is the 90% confidence interval numbers?

On my statistics homework, I have to find the margin of error given only the following: "The results of a recent World Health Organization (WHO) study stated that a 90% confidence interval on the... more
Statistics

3d

College Stats Help

You wish to test the following claim (Ha) at a significance level of α=0.002.      Ho:p=0.73      Ha:p≠0.73You obtain a sample of size n=314 in which there are 210 successful observations. For this... more
Statistics

3d

You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution.

You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 73.While it is an uncommon confidence level, find... more
Statistics

3d

You intend to estimate a population proportion with a confidence interval.

You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a reasonable approximation for the binomial distribution in this... more
Statistics

3d

Out of 400 people sampled, 332 preferred

Out of 400 people sampled, 332 preferred Candidate A. Based on this, estimate what proportion of the voting population (p) prefers Candidate A.Use a 99% confidence level, and give your answers as... more
Statistics

3d

Out of 240 people sampled, 60 had kids. Based on this, construct a 95% confidence

Out of 240 people sampled, 60 had kids. Based on this, construct a 95% confidence interval for the true population proportion of people with kids.
Statistics

3d

A political candidate has asked you to conduct a poll to determine what percentage of people support her.

A political candidate has asked you to conduct a poll to determine what percentage of people support her.If the candidate only wants a 7% margin of error at a 95% confidence level, what size of... more
Statistics

3d

My question is on statistics

In a survey of a group of​ men, the heights in the​ 20-29 age group were normally​ distributed, with a mean of 67.3 inches and a standard deviation of 4.0 inches. A study participant is randomly... more
Statistics

3d

I'm not sure how to solve these three questions. If you could help explain that would be great

"At The Fencing Center, 60% of the fencers use the foil as their main weapon. We randomly survey 22 fencers at The Fencing Center. We are interested in the numbers that do not use the foil as their... more
Statistics Math

4d

Percentiles and Z-scored

Drinks at Ben's Beans have a mean sugar content of 20 grams with a standard deviation of 6 grams. The sugar content in a Grande Cappuccino at Ben's Beans has a z-score of -0.75 compared to the rest... more
Statistics

4d

Combinations and currency

How many possible combinations are there to make $3? This includes pennies, nickels, dimes, quarters, half-dollars, silver dollars, $1 and $2 bills. I have tried to figure this out using... more
Statistics

4d

A group received test scores with a mean of 80 and a standard deviation of 10. How do I calculate what percentile 90 and 60 are in?

Would 90 fall within the top 10% of scores? And does 60 fall within the bottom 10% of scores?
Statistics Math Probability

4d

How do I get the mean/average with the given standard deviation 7ml and percentile which is 10%?

In the word promblem, it stated that a machine was set so that 10% of a 370ml can can contain less that 356ml.I'm not good with word problems and I'm confused which is which.
Statistics

4d

College Math: Help

You wish to test the following claim (Ha) at a significance level of α=0.002.      Ho:p=0.73      Ha:p≠0.73You obtain a sample of size n=314 in which there are 210 successful observations. For this... more
Statistics

4d

Statistics question

On the distant planet Cowabunga , the weights of cows have a normal distribution with a mean of 325 pounds and a standard deviation of 47 pounds. The cow transport truck holds 7 cows and can hold a... more
Statistics Probability

4d

How do I find the expected value for this game?

Hi, I'm having a bit of trouble trying to figure out the expected value for this game, so if you could help that would be really great and helpful. thanks so muchA game involves selecting a card... more
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