8,958 Answered Questions for the topic statistics

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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Statistics

07/15/22

What are the chances that one places exactly 3 bets before stopping?
A roulette wheel has 38 numbers. Eighteen of the numbers are black, eighteen are red, and two are green. When the wheel is spun, the ball is equally likely to land on any of the 38 numbers. Each... more
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Statistics

07/13/22

What is the probability a car's brakes are good given that the mechanic says its brakes are good?

Suppose that of all used cars of a particular year, make, and model, 50% have bad brakes. You are considering buying a used car of this year, make, and model. You take the car to a mechanic to have... more
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Statistics

07/12/22

Suppose that we have a random sample X1, ..., Xn from a Bernoulli(p) distribution. What is the maximum likelihood estimator (MLE) of p?
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Statistics Math Probability

07/12/22

i need help with this :))))
Miranda decided to buy a $50,000 term life insurance policy from Palmetto Insurance Company to cover her until she is 55. She is currently 50 years old and in good health. The probability of death... more
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Statistics

07/11/22

Find the alpha level and the critical region.
I think I understand it however I just want to be certain.GRE scores are on a 130–170 μ = 140 σ = 15n =100, students who took a GRE course to improve their test scores. after the course the average... more
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Statistics Math

07/11/22

Below is a probability distribution for the number of days worked per week for a sample of adults:
Below is a probability distribution for the number of days worked per week for a sample of adults:Task 1: Find the mean of the probability distribution. (remember not to use the built in excel... more
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Statistics

07/11/22

statistics question
A sales agent has received a job offer from a trading house that distributes electric stoves.Suppose that X is the random variable that represents the number of kitchens sold in a week... more
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Statistics

07/11/22

spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
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Statistics

07/11/22

A spinner has equal regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?
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Statistics Math Probability

07/10/22

Probability of certain cards in 10 card poker
Find the probability of being dealt seven clubs and three cards with one card of each other remaining suit in 10​-card poker.
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Statistics Math Probability

07/10/22

What is the probability of these two scenarios?
A shipment of 13 microwave ovens contains 3 defective units. A restaurant buys three of these units. What is the probability of the restaurant buying at least two nondefective​ units?The... more
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Statistics Math

07/10/22

Normal Distribution Question:
The heights of adult males are normally distributed with the following parametersMean: 70 inchesStandard Deviation: 3 inchesTask 1: The average NBA player is 6'7", or 79 inches tall. What is the... more
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Statistics

07/10/22

What is the confidence interval estimate of the population mean μ?

A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a... more
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