8,918 Answered Questions for the topic statistics

Statistics

02/27/23

Probability method
40% chance of rain over 3 days is what method to solve?
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Statistics

02/27/23

Confidence interval using T scores
A recent political poll by the Salt Lake Tribune shows Frmr. Gov. Mitt Romney (R) leading his Utah Senate race with Jenny Wilson (D) 60% to 14% with 26% undecided. The poll sampled 100 likely Utah... more
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Statistics

02/27/23

explain a situation where you would use a dependent samples t-test.

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Statistics Business

02/26/23

Business Statistics
How safe are licensed child-care providers? A recent survey by the Consumer Product Safety Commission (CPSC) raised some concerns about possible safety hazards. The CPSC surveyed 220 licensed... more
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Statistics

02/26/23

Then, suppose an individual receives a raw score of 62 on a national standardized test. With a mean of 58 and a standard deviation of 8, calculate the following scores: Deviation IQ • Stanine • Sten
Then, suppose an individual receives a raw score of 62 on a national standardized test. With amean of 58 and a standard deviation of 8, calculate the following scores:• z-score• T-score• Deviation... more
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Statistics Biostatistics

02/25/23

What is the 90% C.I.
You intend to estimate a population mean � with the following sample. 50.5 60.3 58.8 62 67.4 64.7 69.2 52.6 You believe the population is normally distributed. Find the 90% confidence interval.... more
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Statistics

02/24/23

Confidence Interval

Assume that a sample is used to estimate a population proportion p. Find the 98% confidence interval for a sample of size 237 with 90 successes. Enter your answer as an open-interval (i.e.,... more
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02/24/23

Business Statistics - Probability
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports it can resolve customer problems the same day they are reported in 70%... more
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02/24/23

Buisiness Statistics - Probability
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports it can resolve customer problems the same day they are reported in 70%... more
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02/24/23

Business Statistics - Probability Distribution
Industry standards suggest that 7% of new vehicles require warranty service within the first year. Jones Nissan in Sumter, South Carolina, sold 9 Nissans yesterday. (Round your mean answer to 2... more
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Statistics

02/23/23

A population of N = 14 scores has a mean of μ = 34. After one new score is added, the new population has a mean of μ = 45. What is the value of the score that was added?
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Statistics

02/23/23

The distribution of actual weights of wedges of cheddar cheese produced at a dairy is normal with a mean of 11.9 ounces and a standard deviation of 0.2 ounces.
(Round all answers to 4 decimal places, if needed.)(a) The probability that a randomly chosen wedge of cheddar cheese is greater than 11.83 is .(b) If a sample of 16 is randomly chosen, then the... more
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Statistics

02/23/23

For which of the following scenarios is a chi-square test of homogeneity appropriate?

(A) A car manufacturer examines a random sample of 350 of the warranty claims filed over the past two years to test whether defects are randomly distributed across days of the work week. (B) A... more
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Statistics Math Probability

02/23/23

A state license plate consists of 1 letter followed by 5 digits.
How many different license plates can be made? If no digit could be repeated, how many possible license plates would there be? A witness to a crime saw the first letter and first three digits... more
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Statistics

02/22/23

Statistics questions
P(50.6 < X < 51.6)
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Statistics

02/22/23

Statistics question
The average time between accidents in a factory is 9 weeks. Find the probability that more than 14 weeks pass between accidents.
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Statistics

02/22/23

statistic question
Every day, Jorge buys a lottery ticket. Each ticket has a probability of 0.3 of winning a prize. After six days, what is the probability that Jorge has won at least one prize? Round your answer to... more
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Statistics

02/22/23

statistic question
 A lot of 9 components contains 3 that are defective. Two components are drawn at random and tested. Let A be the event that the first component drawn is defective, and let B be the event that the... more
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Statistics

02/22/23

probability question
At a certain car dealership, the probability that a customer purchases an SUV is 0.16. Given that a customer purchases an SUV, the probability that it is black is 0.32. What is the probability that... more
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Statistics

02/22/23

probability question
In a recent school year in the state of Washington, there were 320,000 high school students. Of these, 156,000 were female and 164,000 were male. Among the females, 11,400 dropped out of school,... more
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Statistics

02/22/23

probability songs
Charles has three songs on a playlist. Each song is by a different artist. The artists are Joey McIntyre, Jennifer Lopez, and Elvis Presley. He programs his player to play the songs in a random... more
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Statistics

02/22/23

Probability dice roll
A fair 6-sided die is rolled three times. What is the probability that all three rolls are 1? Write your answer as a fraction or a decimal, rounded to four decimal places.
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Statistics

02/22/23

Mean =792, sd=60, find highest 15% of population using z-test.
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Statistics

02/22/23

company wants to test the claim that their batteries last more than 40 hours. random sample of 15 batteries yielded a mean of 44.9 hours, with a standard deviation of 8.9 hours. alpha 0.05.
i calculated the t-test and it's 2.13. Can someone explain the following and how we got 0.026? p-value = P(tdf=14 > 2.13) = 0.026because p=0.026 <alpha=0.05 reject H0
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Statistics

02/22/23

Mean and standard deviation help.

A professor knows from past experience that the time for students to complete a quiz is normally distributed with mean 26 minutes and standard deviation 3 minutes.(a) If the teacher... more
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