8,918 Answered Questions for the topic statistics

Statistics Calculus

11/19/23

Method of moments estimator
Let y1, . . . , yn be a random sample of n observations from a random variable Y with f(y) a gamma density with α = 2 and unknown β:f(y) =( (ye^(−y/β))/β^2 for y > 00 else(a) Find the moment... more
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Statistics

11/16/23

What is the probability that the sample proportion of households spending more than $125 a week is between 0.24 and 0.48?
A Food Marketing Institute found that 27% of households spend more than $125 a week on groceries. Assume the population proportion is 0.27 and a simple random sample of 89 households is selected... more
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Statistics

11/16/23

business statistics

You wish to test the following claim (HaHa) at a significance level of α=0.001α=0.001.      Ho:p1=p2Ho:p1=p2       Ha:p1≠p2Ha:p1≠p2 You obtain 115 successes in a sample of size n1=375n1=375 from... more
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Statistics

11/16/23

business statistics

Test the claim that the mean GPA of night students is larger than the mean GPA of day students at the 0.025 significance level.The null and alternative hypothesis would... more
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Statistics

11/15/23

math statistics

In a test of the effectiveness of garlic for lowering​ cholesterol, 44 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment.... more
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11/14/23

How does one calculate the non-centrality parameter (t-distribution) in R?
I’m trying to calculate this parameter to perform a power analysis. I want to know the power to detect a future hypothetical 30% increase in a continuous variable (density). I think my... more
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Statistics

11/14/23

Group Comparison
Section 1 data values: 76.6, 87.2, 78.6, 83.5, 68.8, 75.5, 92.9, 84.4, 89.2Section 2 data values: 65.6, 66.5, 92.1, 71.4, 72.8, 52.4, 76.6, 88.5, 49.8Section 3 data values: 75.8, 87, 89.5, 82.1,... more
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Statistics

11/13/23

Linear Regression
Let y-hat represent the profit (or loss) for a certain company x years after 1975. Based on the data shown below, a statistician calculates a linear model y^= -0.71x + 14.39. Use the model to... more
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Statistics Math Probability

11/13/23

Can you help me with this question
A genetic experiment involving peas yielded one sample of offspring consisting of 433 green peas and 166 yellow peas. Use a 0.01 significance level to test the claim that under the same​... more
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Statistics

11/13/23

What is the test statistic? What is the p-score?
Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. "Wrinkle recovery angle" measures how well a fabric recovers from wrinkles. Higher is better. Here... more
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11/13/23

Statistics question
In a chi-square goodness of fit test of, the number of degrees of freedom equals the:a. number of observations minus one.b. number of sample observations minus the missing observations.c. number of... more
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Statistics

11/11/23

What is P(At least 1 green) =
Suppose that you have 7 green cards and 5 yellow cards. The cards are well shuffled. You randomly draw two cards without replacement. G1 = the first card drawn is greenG2 = the second card drawn is... more
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Statistics

11/10/23

What is the test statistic and p-value?
The mean number of English courses taken in a two–year time period by American and international college students is believed to be different. An experiment is conducted and data are collected and... more
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Statistics

11/10/23

What is the test statistic and p-value?
Test the claim that the proportion of men who own cats is significantly different than the proportion of women who own cats at the 0.01 significance level. Use pooling. The null and alternative... more
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Statistics

11/09/23

Business statistics

Test the claim that the proportion of people who own cats is larger than 40% at the 0.10 significance level.The null and alternative hypothesis would... more
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Statistics

11/09/23

Business statistics

You wish to test the following claim (HaHa) at a significance level of α=0.005α=0.005.      Ho:μ=55.5Ho:μ=55.5       Ha:μ≠55.5Ha:μ≠55.5You believe the population is normally distributed, but you do... more
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Statistics Math

11/09/23

Statistics Problem
A certain newspaper provides the net asset value, the year-to-date percent return, and the three-year percent return for 882 mutual funds at the end of 2017. Assume that a simple random sample of... more
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Statistics

11/09/23

Statistics Problem
Barron's reported that the average number of weeks an individual is unemployed is 18.5 weeks. Assume that for the population of all unemployed individuals the population mean length of unemployment... more
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Statistics

11/09/23

Statistics problem
An air transport association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50... more
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Statistics

11/09/23

Statistics theory question. Please help asap!
What is wrong with this statement: "After that, I compare the Y~X model to the Y~Z model using the ANOVA () function." This sentence is wrong because:....
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Statistics

11/08/23

Business statistics

Trydint" bubble-gum company claims that 9 out of 10 people prefer their gum to "Eklypse". Test their claim at the 95 confidence level.The null and alternative hypothesis in symbols would... more
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Statistics

11/08/23

Business statistics
Suppose that BC financial aid allots a textbook stipend by claiming that the average textbook at BC bookstore costs $$ 87.05. You want to test this claim. The null and alternative hypothesis in... more
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Statistics

11/08/23

Find the value of P(X<−2)
We are working on discrete random variables
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Statistics

11/08/23

What is the probability that the child spends less than 3.3 hours per day unsupervised.

On the planet of Mercury, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.3 hours... more
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Statistics

11/07/23

 Normal Distribution: Credit card balances, consisting of mean = $5000, standard deviation = $900.
If credit card balances are normally distributed with a mean of $4200 and a standard deviation of $900, find the probability that a randomly selected credit card holder has a credit card balance of... more
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