8,918 Answered Questions for the topic statistics

Statistics Math Geometry

09/28/22

A​ 99% confidence level requires __?___ subjects. (Round to the nearest subject)
A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence... more
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Statistics

09/28/22

Use the Normal model ​N(​100,16​) describing IQ scores to answer the following.
​a) What percent of​ people's IQs are expected to be over 80 ​?​b) What percent of​ people's IQs are expected to be under 85​?​c) What percent of​ people's IQs are expected to be between 116 and... more
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Statistics Math

09/28/22

An ordinary fair die was rolled 100 times...
An ordinary fair die was rolled 100 times. The results were summarised in a frequency table and the mean score was calculated to be 3.46. It was later discovered that the frequencies, 15 and 20, of... more
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Statistics

09/27/22

Explain why a sample chosen from magazine subscription lists, automobile registration lists, phone books, and club membership lists was not representative of the population of the United States

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Statistics Calculus

09/27/22

Find upper bound and lower bound? (statistics)
A simple random sample of size n is drawn. The sample​ mean, x​, is found to be 19.2​, and the sample standard deviation, s, is found to be 4.8.Construct a 95​% confidence interval about μ if the... more
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09/27/22

What does n=? (statistics)
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 2 percentage points with 90​%... more
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Statistics

09/26/22

What is the Expected Value of the bet below? Flip a coin two times. If it's "heads" both times, you win $100. Any other outcome (other than heads-heads), you lose $50.

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Statistics

09/26/22

find the expected number of wins in a season.
Basketball regression line prediction:Suppose the equation for the regression line for the number of games won in a season, y, is given by:y=101−0.048xwhere x is number of turnovers by the team in... more
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Statistics Probability

09/26/22

Mean and Standard Deviation of Binomial Distribution
A company produces processing chips for cell phones. At one of its large factories, 2% of the chips produced are defective in some way. A quality check involves randomly selecting and testing 500... more
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Statistics

09/25/22

Distribution of sample population
Suppose 40% of the students in a university are baseball players.If a sample of 743students is selected, what is the probability that the sample proportion of baseball players will differ from the... more
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Statistics

09/25/22

WHAT IS Q IN STATISTICS?
What is Q in statistics? What is it used for, what is its value and how is it calculated?
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Statistics

09/24/22

population proportion
Assume that a sample is used to estimate a population proportion p. Find the 99% confidence interval for a sample of size 128 with 24% successes. Enter your answer as an open-interval (i.e.,... more
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Statistics

09/24/22

Compute SS variance and standard deviation for the following population. Scores: 1,3,9,3
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09/23/22

How can i pay for the lesson i had from Steve P.
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Statistics

09/23/22

Statistic probability distribution

A baseball player has a batting average of 0.335. what is the probability that he has exactly 4 hits in his next 7 at bats? Round answer to four decimal places.
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Statistics

09/23/22

I need help finding the answers

A standard deck of cards contains 52 cards. One card is selected from the deck. (A) compute the probability of randomly selecting a four or a ten. (B) compute the probability of the randomly... more
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Statistics Probability

09/23/22

Probability and statistics

Diane is putting 12 colored light bulbs into a string of lights. There are 3 vellow light bulbs, 6 blue light bulbs, and 3 orange light bulbs. How many distinct orders of light bulbs are there if... more
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Statistics Probability

09/23/22

Probability and statistics

(a) There are 17 appetizers avallable at a restaurant. From these, Torn is to choose 13 for his party.How many groups of 13 appetizers are possible?(b) A certain committee consists of 18 people.... more
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Statistics Probability

09/23/22

Probability and statistics

A survey found that 37% of people earning between $30,000 and $75,000 said that they were very happy. If 5 people are selected at randorn, find the probability that at most 1 person who earns... more
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Statistics

09/23/22

Stat question 9
The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 35 liters, and standard deviation of 2.1 liters.A) What is the probability that daily production... more
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Statistics

09/23/22

Stat question 8
A particular fruit's weights are normally distributed, with a mean of 284 grams and a standard deviation of 32 grams.The heaviest 13% of fruits weigh more than how many grams?
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Statistics

09/23/22

Stat question 7
A particular fruit's weights are normally distributed, with a mean of 287 grams and a standard deviation of 17 grams.If you pick one fruit at random, what is the probability that it will weigh... more
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Statistics

09/23/22

Stat question 6
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.2 years, and standard deviation of 1.6 years.If you randomly purchase one item, what is the probability... more
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Statistics

09/23/22

Stat question 5
The lengths of a professor's classes has a continuous uniform distribution between 50.0 min and 52.0 min. If one such class is randomly selected, find the probability that the class length is more... more
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Statistics

09/23/22

Stat question 4
About what percentage of the area under the curve of the standard normal distribution is outside the interval z=[−2.96,2.96]z=[-2.96,2.96] (or beyond 2.96 standard deviations of the mean).
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