8,918 Answered Questions for the topic statistics

Statistics

07/21/22

Math Question #2
Based on historical data, your manager believes that 33% of the company's orders come from first-time customers. A random sample of 76 orders will be used to estimate the proportion of... more
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Statistics

07/21/22

Math Question # 1
A population of values has a normal distribution with μ=80.6μ=80.6 and σ=34.8σ=34.8. You intend to draw a random sample of size n=151n=151.1.1, What is the mean of the distribution of sample... more
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Statistics

07/20/22

Statistics Question
You wish to test the following claim (HaHa) at a significance level of α=0.002α=0.002.      Ho:μ=52.8Ho:μ=52.8       Ha:μ>52.8Ha:μ>52.8You believe the population is normally distributed, but... more
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Statistics

07/20/22

Statistics Question
You wish to test the following claim (HaHa) at a significance level of α=0.05α=0.05.      Ho:μ=76.9Ho:μ=76.9       Ha:μ<76.9Ha:μ<76.9You believe the population is normally distributed, but... more
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Statistics Math

07/20/22

Confidence Interval for Sample Mean
A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05)What is the value of the sample... more
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Statistics Math

07/19/22

Statistics - Pareto Distribution
I'm taking an Mathematical Stat course at university and I came up with this question.Question can be found via(the question involves hard to type notations, so I thought of uploading it and... more
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Statistics Math

07/19/22

Statistics - Pareto Distribution
Hello everyone! I'm taking an Mathematical Stat course at university and I came up with this question.Question can be found via(the question involves hard to type notations, so I thought of... more
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Statistics Math Sat Math

07/19/22

Statistics - Method of Moment Parameter Estimator
Let X1, X2, X3, ..., Xn be a random sample of size n from the population with mean µ and variance σ2 .What is the estimator of the population parameter σ2 if we use the moment method?
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Statistics Probability

07/19/22

What is the probability of flipping 3 coins and all three landing on heads? P(Answer ) = Answer 0.125 (Enter your answer as a decimal. Do not round.) HINT: Change the fraction to a decimal.

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Statistics

07/19/22

For this study, we should use z-test for a population proportion Correct The null and alternative hypotheses would be:
10% of all students volunteer. Is the percentage of students who are volunteers different from students receiving financial aid? Of the 359 randomly selected students who receive financial aid, 39... more
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Statistics

07/19/22

Math Question 4
Given the interval estimate for the mean (5.2, 15.2), the point estimate for the mean is , and the margin of error is 
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Statistics

07/19/22

Math Question 3

You measure 29 randomly selected textbooks' weights, and find they have a mean weight of 53 ounces. Assume the population standard deviation is 12.4 ounces. Based on this, construct a 95%... more
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Statistics Math

07/18/22

Assume that military aircraft use ejection seats ?
Assume that military aircraft use ejection seats designed for men weighing between 138.9 lb and 203 lb. If​ women's weights are normally distributed with a mean of 171.8 lb and a standard deviation... more
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Statistics

07/18/22

Hypothesis Tests for a Single Population Proportion
Test the claim that the proportion of people who own cats is significantly different than 90% at the 0.1 significance level.The null and alternative hypothesis would... more
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Statistics

07/17/22

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 232-cm and a standard deviation of 1.2-cm. For shipment, 26 steel rods are bundled together.
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 232-cm and a standard deviation of 1.2-cm. For shipment, 26 steel rods are bundled together.Find... more
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Statistics

07/17/22

A study was conducted on students from a particular high school over the last 8 years....
A study was conducted on students from a particular high school over the last 8 years. The following information was found regarding standardized tests used for college admitance. Scores on the SAT... more
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Statistics

07/16/22

Confidence Intervals - Means
You measure 26 textbooks' weights, and find they have a mean weight of 62 ounces. Assume the population standard deviation is 5 ounces. Based on this, construct a 95% confidence interval for the... more
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Statistics

07/15/22

Statistics and Probability

What price do farmers get for their watermelon crops? In the third week of July, a random sample of 40 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that 𝜎 is... more
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Statistics

07/15/22

Statistics on stimulant abuse and congestive heart failure
I want to know what percentage of people who have had a history of stimulant abuse die of congestive heart failure and other heart related diseases?
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Statistics Math

07/15/22

Method of Moment Estimators
A sample of 4 observations (0.4, 0.7, 0.7, 0.9) collected from a continuous distribution with density,f(x) = θ*(x^(θ−1)) ; 0 < x < 1Estimate θ by the method of moment.
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Statistics

07/15/22

Stats Homework...
Suppose that a car company wants to determine the importance to consumers for service like OnStar, which offers drivers a wifi connection (among other things). Small/preliminary studies have... more
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Statistics

07/15/22

Statistics Homework
You want to obtain a sample to estimate the proportion of a population that possess a particular genetic marker. Based on previous evidence, you believe approximately p∗=42%p∗=42% of the population... more
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Statistics

07/15/22

Statistics Homework
Out of 200 people sampled, 74 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.Give your answers as decimals, to three places <... more
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Statistics

07/15/22

Statistics Homework
If n = 380 and ˆpp^ (p-hat) = 0.3, construct a 90% confidence interval.Give your answers to three decimals
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Statistics

07/15/22

What is the probability of winning the jackpot for the fifth time on the twentieth attempt?
Slot machines have three drums with the same number of positions on each drum. Each position contains a symbol. When you pull the lever on the machine, the drums spin. Assume that each drum is... more
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