8,972 Answered Questions for the topic statistics

Statistics Probability

11/12/22

Help me with this statistics homework please asap
1) A tyre manufacturer claims that more than 85% of the company’s tyres will last at least 80,000km. In a random sample of 400 tyres, 22 wore out before reaching 80,000km. Do the data support the... more
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Statistics

11/11/22

In a normal distribution
what is the probability that a random sample of 305 with population proportion 0.46 has a sample proportion of between 0.42 and 0.42?
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Statistics

11/11/22

About 6% of the population has a particular genetic mutation. 300 people are randomly selected. Find the mean for the number of people with the genetic mutation in such groups of 300.
About 6% of the population has a particular genetic mutation. 300 people are randomly selected.Find the mean for the number of people with the genetic mutation in such groups of 300.
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Statistics

11/11/22

standard deviation

The national average for mathematicsSATS in 2011 was 514. Suppose that the distribution ofscores was approximately bell-shaped and that the stan-dard deviation was approximately 40. Within... more
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Statistics

11/10/22

probability with replacement
You pick three cards from a deck of 52 cards and putting them back in. What is the probability that you get a Jack, a king, a queen?
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Statistics

11/10/22

Interpret the lower quartile
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Statistics

11/10/22

Find and interpret the lower quartile and upper quartile of the mental development index.
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Statistics

11/10/22

statistics homework 8.2
A genetic experiment involving peas yielded one sample of offspring consisting of 448 green peas and 140 yellow peas. Use a 0.01 significance level to test the claim that under the... more
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Statistics Probability

11/09/22

Probability Question
Robin bought a four-scoop ice cream cone having a scoop each of vanilla, chocolate, strawberry and cherry. In how many orders can the four scoops be stacked on the cone if they are stacked one on... more
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Statistics

11/09/22

express the confidence interval (0.47,0.63) in the form p-hat + or - moe.
Statistics
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Statistics

11/06/22

Homework help needed I can not figure this one out

Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is 122000 dollars. Assume... more
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Statistics

11/06/22

Homework question help please

CNNBC recently reported that the mean annual cost of auto insurance is 1040 dollars. Assume the standard deviation is 280 dollars. You take a simple random sample of 70 auto insurance policies.... more
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Statistics

11/06/22

Statistics homework question

CNNBC recently reported that the mean annual cost of auto insurance is 1041 dollars. Assume the standard deviation is 300 dollars. You take a simple random sample of 91 auto insurance policies.Find... more
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Statistics

11/06/22

Suppose a math class contains 35 students. There are 15 females (four of whom speak Spanish) and 20 males (five of whom speak Spanish). Give all answers as decimals to at least two decimal places.
Suppose a math class contains 35 students. There are 15 females (four of whom speak Spanish) and 20 males (five of whom speak Spanish). Give all answers as decimals to at least two decimal... more
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Statistics

11/05/22

Statistics help
Suppose a jar contains 9 red marbles and 14 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the probability that both are red.
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Statistics

11/05/22

how to solve this problem
HOW TO SOLVE THIS PROBLEM!Consider a binomial experiment with n = 4 trials where the probability of success on a single trial is p = 0.45. (Round your answers to three decimal places.)(a)... more
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Statistics

11/05/22

STAT homework help
In a survey, 13 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40 and standard deviation of $17. Construct a... more
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Statistics

11/05/22

STAT homework help
In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38 and standard deviation of $4. Find the margin of... more
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Statistics

11/05/22

For a standard normal distribution, find: P(z > c) = 0.5586 Find c.
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Statistics Biostatistics

11/04/22

What are the sample mean and margin of error?
50 random flights from D.C to New York City were selected and the resulting 95% confidence interval was (82.5, 88.7). What are the sample mean and margin of error?
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Statistics Biostatistics

11/04/22

How to find and calculate the info below
It is believed that the mean flight time from Seattle to New York City is 310 minutes. You want to test to determine if it is different from this. The population standard deviation is 10... more
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Statistics Math

11/04/22

Confidence Interval
You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 86.5 73 84.1 77.7 84.9 79.3 87.4 84.4 67.5 86.1 69 Find the 95% confidence interval. Enter... more
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Statistics

11/03/22

How can I combine 12 events with 3 possible outcomes each(pass fail or average) in every possible arrangement

Am I using combination or permutation??
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Statistics

11/03/22

Hi I need help with this stat question
Improving SAT scores. Refer to the Chance (Winter 2001) study of students who paid a private tutor (or coach) to help them improve their Standardized Assessment Test (SAT) scores, Exercise 4.50 (p.... more
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Statistics

11/02/22

Statistics Question
 How many ways are there to select 4 candidates from 9 equally qualified recent graduates for openings in an accounting firm?
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