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Statistics

05/18/22

Determining sample size

Find The minimum sample size needed to estimate the proportion of voters favoring a candidate if we want our estimate to be within 3.2% as the margin of error and a confidence level of 90%. A... more

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Statistics Probability

05/18/22

Indicated probability

A building has 3 parking stalls in front. Find the different number of ways that two different cars can park in the stall.

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Statistics Probability

05/18/22

Indicated probability

Two dice are rolled. What is the probability that the sum of the two numbers on the dice will be three

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Statistics

05/18/22

A vote is to be taken among the residents of a town and the surrounding county to determine whether a proposed chemical plant should be constructed. The construction site is within the town limits,... more

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Statistics Math

05/18/22

Statistics problem

Each person has a 75% probability of going to the Ches Tahoe restaurant. a. You randomly select 8 people. What is the probability that 5 people will not go to the restaurant? b. You randomly select... more

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Statistics Math Probability Maths

05/17/22

(a) state the null and alternative hypothesis, (b) select and compute the test statistic, (c) determine the critical value and the rejection region, and (d) draw a conclusion.

Direction: In the following problem, (a) state the null and alternative hypothesis, (b) select and compute the test statistic, (c) determine the critical value and the rejection region, and (d)... more

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Statistics

05/17/22

Confidence interval

Newsweek performed a poll in which 500 American parents were asked the question, “Would you prefer to have your child taught by a male or female for grades K-2?” Only 40% responded that they would... more

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Statistics

05/17/22

Teachers’ Salaries in North Dakota The average teacher's salary in North Dakota is 35441 . a normal distribution with 5100 . Round final answers to at least decimal 4 places

assume normal distribution is 5100

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Statistics Homework Help In Stats

05/16/22

b. What percentage of all possible observations of the variable are at most 12?

Assume that the variable under consideration has a density curve. The area under the density curve that lies to the right of 12 is 0.371. a. What percentage of all possible observations of the... more

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Statistics

05/16/22

Find the 95% confidence interval for estimating the population mean μ If sample mean X = 50, sample size n= 60 and population standard deviation σ is known to be 10.

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Statistics

05/16/22

Assume that the IQ scores have a normal distribution with mean 100 and standard deviation of 8

Assume that the IQ scores have a normal distribution with mean 100 and standard deviation of 8. Determine the probability that the IQ scores of a randomly selected person is: a) Less than 106 b)... more

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Statistics Data Science

05/16/22

Consider a p-dimensional hypercube, What is the probability of the event...

Considering a p-dimensional hypercube H_1^p = [-1,1]^p.Assume we draw two p-dimensional points, a = (a_1, a_2, ..., a_p) and b = (b_1, b_2, ..., b_p) uniformly at random from this hypercube.Denote... more

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Statistics

05/15/22

Statistics - Expected Value

A process for producing an industrial chemical yields a product containing two types of impurities.For a specified sample from this process, let Y1 denote the proportion of impurities in the sample... more

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Statistics

05/13/22

What is the probability of rolling a five with two dice?

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Statistics

05/11/22

A student averages 70% on multiple choice tests. What is the probability that he misses the first 3 questions until he gets a question correct?

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Statistics

05/10/22

P(z > c) = 0.6592

Find c rounded to two decimal places

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Statistics

05/10/22

P(z > c) = 0.6592

Find c rounded to two decimal places

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Statistics Probability

05/10/22

How many ways can this be done?

Three research departments have 10, 6, and 8 members, respectively. Each department is to select a delegate and an alternate to represent the department at a conference. In how many ways can this... more

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Statistics Probability

05/10/22

In how many ways?

A university student is selecting courses for his next semester. He can choose from 3 humanities courses and 10science courses. In how many ways can he choose 7courses if fewer than 2 must be... more

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Statistics

05/10/22

Draw the Boxplot

Areas of Islands The data show the sizes in square miles of notable islands in the Baltic Sea and the Aleutian Islands. Baltic Sea Aleutian... more

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Statistics

05/10/22

Enter your answers as fractions or decimals rounded to three decimal places.

A bag contains 5 red marbles, 9 white marbles, and 6 blue marbles. Randomly choose two marbles, one at a time, and without replacement. Find the following. Enter your answers as fractions or... more

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Statistics

05/10/22

Find the probability that the student is taking calculus, given that he or she is on the dean's list.

At a large university, the probability that a student takes calculus and is on the dean's list is 0.100. The probability that a student is on the dean's list is 0.20. Find the probability that the... more

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Statistics Probability

05/09/22

The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an individual’s clotting time will be less than 2 seconds or greater than 11?

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Statistics

05/09/22

Calculate the margin of error for this survey. Round the percentage to one decimal place. Do not round intermediate steps

fear of the dark is quite common among children. However, what about adults? One polling agency released the results of a survey that asked people over 40 years old if they keep the lights on at... more

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Statistics

05/09/22

Round your final answer to one decimal place.

Home Internet Access In a recent year, a study found that 77% of adults ages 18–29 had internet access at home. A researcher wanted to estimate the proportion of undergraduate college... more

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Determining sample size

Indicated probability

Indicated probability

Inferential Statistics

Statistics problem

(a) state the null and alternative hypothesis, (b) select and compute the test statistic, (c) determine the critical value and the rejection region, and (d) draw a conclusion.

Confidence interval

Teachers’ Salaries in North Dakota The average teacher's salary in North Dakota is 35441 . a normal distribution with 5100 . Round final answers to at least decimal 4 places

b. What percentage of all possible observations of the variable are at most 12​?

Find the 95% confidence interval for estimating the population mean μ If sample mean X = 50, sample size n= 60 and population standard deviation σ is known to be 10.

Assume that the IQ scores have a normal distribution with mean 100 and standard deviation of 8

Consider a p-dimensional hypercube, What is the probability of the event...

Statistics - Expected Value

What is the probability of rolling a five with two dice?

A student averages 70% on multiple choice tests. What is the probability that he misses the first 3 questions until he gets a question correct?

P(z > c) = 0.6592

P(z > c) = 0.6592

How many ways can this be done?

In how many ways?

Draw the Boxplot

Enter your answers as fractions or decimals rounded to three decimal places.

Find the probability that the student is taking calculus, given that he or she is on the dean's list.

The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an individual’s clotting time will be less than 2 seconds or greater than 11?

Calculate the margin of error for this survey. Round the percentage to one decimal place. Do not round intermediate steps

Round your final answer to one decimal place.

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b. What percentage of all possible observations of the variable are at most 12?