8,839 Answered Questions for the topic statistics

Statistics Epidemiology

07/29/25

How to treat ordinal predictors in the context of multiple linear regression
Hi all, I have a question regarding an analysis I’m trying to do right now concerning data of 100 patients. I have a transformed normally distrubuted continuous outcome Y. My predictor X is... more
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Statistics

07/27/25

F-distribution P-value
How do you find the p-value for f-distrubutions without using a table? I can't get a correct answer using the table and I can't figure it out.
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Statistics

07/20/25

How do I calculate the median of a data set?
I have this list: 7, 12, 14, 18, 20, 22, 25. How do I know which number is the median?
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Statistics

07/09/25

HeLp Im LoSt I dOnT kNoW hOw To Do My StAts
SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is interested in estimating the average SAT score of first-year students. If... more
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Statistics Math

06/26/25

NEED HELP for STATS - don't know where to start!!!
2. You have designed an experiment to investigate the behavior of Himalayan hamsters. In this experiment, a hamster is shown five closed boxes. Two of these boxes contain treats while the others... more
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Statistics Math

06/26/25

Really struggling with this stats problem—any help would mean a lot
The 5-factor model is a popular theory of personality, the 5 factors being Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. The Agreeableness scores of a random sample of... more
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Statistics

06/19/25

Statistic Question
Based on the data shown below, calculate the correlation coefficient (rounded to three decimal... more
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Statistics

05/28/25

High School Statistics
A bakery sells two types of muffins: blueberry and chocolate chip. Based on sales data, 60% of customers buy blueberry muffins, and 40% buy chocolate chip muffins. The bakery wants to... more
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Statistics

05/14/25

Assume that there are 9 girls and 10 boys in the neighborhood club, and a team of 7 is to be selected.

1) How many different teams can be selected? (2) How many different teams can be selected if each team must contain exactly 4 girls and 3 boys?
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Statistics

05/09/25

When should I use the sample formula for variance and standard deviation and when should I use the population formula for these measures of variability?

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Statistics

04/30/25

Test Whether Drinking Coffee Increases Productivity
A company wants to determine if drinking coffee increases productivity. A random sample of 50 employees measures productivity per day (# tasks completed) both before and after consuming coffee for... more
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Statistics

04/28/25

Flipping a coin probability

Are Paul and Alan's conclusions about the coin's fairness statistically valid. why and why not-Paul flips the coin 10 times.-Paul says the coin is not fair because 7 of the results are... more
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Statistics Math

04/03/25

How do I use standard deviation to explain why 95% is acceptable?
In this company, results are sent to customers within 2 working days. This is the target turnaround time. Below is the mean % of results sent out within the expected turnaround time for each... more
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Statistics Psychology R

03/30/25

Need help in creating a research design and/or proposal?
I am a research master's student in social and health psychology. I have been trained to conduct research, which includes creating research designs/experiments and writing research proposals for... more
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Statistics Probability

03/29/25

Probability of Two University Women being 65.5 Inches or Shorter
The Empirical Rule states that for bell-shaped distributions, about 68% of the values fall within 1 standard deviation of the mean. The heights of women at a large university are approximately... more
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Statistics

03/20/25

Solve the following

Random samples with size 4 are drawn from the population containing the values 19, 14, 26, 31, 53 and 44 a. Construct a sampling distribution of the sample means.b. Find the mean of the sample... more
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Statistics

03/15/25

I thought I had an appointment this afternoon
I scheduled an appointment this afternoon. I can’t see it.please contact me.Carlos
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Statistics Math

03/12/25

A population of values has a normal distribution with a population mean of 216.6 and standard deviation of 45.9 . You intend to draw a random sample of 230.
Find the probability that a single randomly selected value is between 209 and 210.5.P(209 < X < 210.5) = Find the probability that a sample of size n=230 is randomly selected with a mean... more
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Statistics Math

03/11/25

CNNBC recently reported that the mean annual cost of auto insurance is 1031 dollars. Assume the standard deviation is 177 dollars. You will use a simple random sample of 102 auto insurance policies.
Find the probability that a single randomly selected policy has a mean value between 1039.8 and 1083.6 dollars.P(1039.8 < X < 1083.6) = Find the probability that a random sample of size n =... more
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Statistics Math

03/07/25

Intergalactic president Zaphod Beeblebrox enjoys a 78% approval rating among residents of planets in the vicinity of Betelgeuse.
Find the probability that at most 109 residents of planets near Betelgeuse, taken out of a random sample of 126, approve of Zaphod Beeblebrox.
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Statistics Math

03/07/25

A recent poll shows that 76% of voters disapprove of the job that congress is doing.

Find the probability that at least 136 people disapprove of congress out of a random sample of 199.
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Statistics Math

03/07/25

According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green.

You randomly select peanut M&M’s from an extra-large bag looking for a yellow candy. (Round all probabilities below to four decimal places; i.e. your answer should look like 0.1234, not... more
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Statistics Math

03/07/25

Residents of the Shire, being generally distrustful of wizards, give Gandalf an approval rating of 28%

Find the probability that fewer than 19 residents of the Shire, taken out of a random sample of 112, approve of Gandalf.
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Statistics

02/20/25

Standard deviation
My tutor has asked me to add Standard Deviation, not Standard Error to a table. He says to "derive SD, to multiple SE by the root mean square of the sample size. Root mean square of 138"My sample... more
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Statistics Math

02/11/25

How long would it take a super computer to solve a Three layer Rubic cube using only random moves and showing the result of each move? My estimate is 50 Million years
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