8,918 Answered Questions for the topic statistics

Statistics

07/17/23

You generate a scatter plot using Excel. You then have Excel plot the trend line and report the equation and the R squared value. The regression equation is reported as
y=18.75x+12.43and the R2= 0.5041What is the correlation coefficient for this data set?
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Statistics

07/17/23

Run a regression analysis on the following bivariate set of data with y as the response variable.
... more
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Statistics

07/17/23

A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y).
y=ax+b a=-0.859 b=30.33 r2=0.394384 r=-0.628 Use this to predict the number of situps a person who watches 10 hours of TV can do (to one decimal place)
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07/16/23

Counting problem
There are exactly 20 students currently enrolled in a class. How many different ways are there to pair up the 20 students, so that each student is paired with one other student? Solve this in at... more
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Statistics Math

07/16/23

Card Probability
Consider the standard 52-card deck (4 suits, each consists 13 ranks)Jack randomly draws 3 cards from the deck. Question: 1) what's the probability that he gets all three Aces? 2) what's the... more
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Statistics

07/15/23

choosing the right answer

I have a low variation data and trying to choose the right model for it including random effect and fama and French 1973 and pooled OLS . so I need help to with that of you can please let me know
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Statistics

07/14/23

Confidence Intervals
You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 99%... more
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Statistics Math Algebra 2 Sat Math

07/12/23

Double Checking So Can Someone tell me what the answer is
A calculus exam that was taken by 99 students is recorded and normally distributed. The mean score on the exam is 77 and the standard deviation is 2.6. What percent of the scores are in the 74.4... more
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Statistics Math Algebra 2 Sat Math

07/12/23

Double Checking So Can Someone tell me what the answer is
A calculus exam that was taken by 99 students is recorded and normally distributed. The mean score on the exam is 77 and the standard deviation is 2.6. What percent of the scores are in the 74.4... more
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Statistics Math Algebra 2 Sat Math

07/12/23

Double Checking So Can Someone tell me what the answer is
A calculus exam that was taken by 99 students is recorded and normally distributed. The mean score on the exam is 77 and the standard deviation is 2.6. What percent of the scores are in the 74.4... more
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Statistics

07/11/23

Statistic question
A small pilot study was conducted prior to planning a large research study investigating the average SAT-verbal scores of students at one large high school. In the sample mean was 688 with a... more
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Statistics

07/09/23

Out of 400 people sampled, 276 had kids. Based on this, construct a 95% confidence interval for the true population proportion of people with kids.

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Statistics

07/08/23

Sampling Distributions and Central Limit
The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days and a standard deviation of 14 days.In what range would you expect to find the middle 50% of... more
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Statistics

07/08/23

Hypothesis Testing
You wish to test the following claim (Ha) at a significance level of α=0.001Ho:μ=51.9      Ha:μ>51.9You believe the population is normally distributed and you know the standard deviation... more
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Statistics

07/08/23

Hypothesis Testing

You wish to test the following claim (Ha) at a significance level of α=0.02      Ho:p=0.46      Ha:p≠0.46You obtain a sample of size n=681 in which there are 335 successful observations. For this... more
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Statistics

07/08/23

Sampling Distribution/Central Limit
A manufacturer knows that their items have a lengths that are skewed right, with a mean of 14.6 inches, and standard deviation of 4.7 inches.If 39 items are chosen at random, what is the... more
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Statistics

07/08/23

Confidence Interval Estimate

In a Harris poll of 2000 human resource professionals, 41.8% said that body piercings and tattoos were big grooming red flags. Construct a 95% confidence interval estimate for the proportion of all... more
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Statistics

07/05/23

Answer with problem

 Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15(as on the wechsler test). Find the probability that a randomly selected adult has... more
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Statistics

07/04/23

Sampling Distribution of Proportion - Hypothesis testing
Suppose that 75% of apples are worm-free. Explain why it would not be unusual to find 80% or more of a simple random sample of 120 apples to be worm-free but it would be unusual to find 80% or... more
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Statistics

07/01/23

At the 1% significance level, can you conclude that the mean number of calories per scoop are different for these two brands of performance feed?
 A sample of 14 scoops of Brand I performance feed gave the mean number of calories of 156 per scoop  with a standard deviation of 38 calories. Another sample of 18 cans of Brand II performance... more
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Statistics

07/01/23

Using the 2.5% significance level, can you conclude that the ERS claim is false?
The ERS  claims that the average net worth of chicken farmers in Kansas is at least  $40,000. A random sample of 35 chicken farmers had a mean net worth of $28,000. Assume that the net worth of all... more
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Statistics

07/01/23

Using the 2% significance level, can you conclude that the mean length of all current long-distance calls is different from 13.74 minutes?
The average length each vet clinic visit was 13.74 minutes. The vet’s management wanted to check if the mean length of visits is different from 13.74 minutes. A sample of 150 visits produced a mean... more
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Statistics

07/01/23

Find the p–value for this test. What will your decision be if α = .01? What if α = .05?
 A researcher finds that swine in their study gain an average of 8  pounds or more after being fed the trial feed. The feed company sponsor wanted to check this claim and took a random sample of 32... more
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Statistics

06/30/23

You believe the population is normally distributed, but you do not know the standard deviation. You obtain the following sample of data: data 90.4 116.4 85.9 90.4
You wish to test the following claim (Ha��) at a significance level of α=0.05�=0.05.      Ho:μ=51.6��:�=51.6      Ha:μ>51.6��:�>51.6You believe the population is normally distributed, but you... more
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Statistics

06/30/23

I spun a penny 175 times and got 70 heads. We wish to find how significant is this evidence against equal probabilities. What is the sample proportion of heads?
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 175 times and got 70 heads. We wish to find how significant is this evidence against equal... more
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