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Statistics

04/05/22

Please help me find How many of the 15 students do we expect to attend the festivities? (Round your answer to the nearest whole number.)

A school newspaper reporter decides to randomly survey 15 students to see if they will attend Tet (Vietnamese New Year) festivities this year. Based on past years, she knows that 13% of students... more

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Statistics

04/05/22

Which of the following correlation coefficient represents the most linear function? A 0.976 B 0.001. C- 0.002 D - 0989

Which of the following correlation coefficient represents the most linear function?A 0.976B 0.001.C- 0.002D - 0989

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Statistics

04/05/22

What is the probability

Studies have shown that girls at age 3 have heights that are normally distributed with a mean of 37 inches and a standard deviation of 3.5 inches. c. What is the probability that a 3-year-old girl... more

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Statistics

04/04/22

Find Upper and Lower Bounds on CI

Do male and female servers work the same number of hours? A sample of 21 female servers worked an average of 33 hours per week, with a standard deviation of 2. A sample of 24 male servers worked an... more

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Statistics

04/04/22

please help me find the standard deviation of this question

The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U.S. 71.4% of those students... more

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Statistics

04/04/22

Please help me find p(X=x) and x*P(X=x) to complete the table

Suppose that you are offered the following "deal." You roll a die. If you roll a six, you win $10. If you roll a four or five, you win $5. If you roll a one, two, or three, you pay $4.Construct a... more

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Statistics

04/04/22

statistics chapter 11-13

The World Series ends when a team wins 4 games. Suppose that sports analysts consider one team a bit stronger, with a 55% chance to win any individual game. Estimate the likelihood that the... more

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Statistics

04/04/22

statistics expected gain or loss

You buy a lottery ticket to a lottery that costs $10 per ticket. There are only 100 tickets available to be sold in this lottery. In this lottery there are one $445 prize, two $95 prizes, and... more

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Statistics

04/03/22

Find z such that 64% of the standard normal curve lies between −z and z. (Round your answer to two decimal places.)

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Statistics

04/03/22

Binomial Distribution: Standard Deviation, am I getting this wrong?

I am testing out a Binomial distributed dataset in excel.The dataset is litterally a "RANDBETWEEN(1;2)" So it simply randomizes between the number 1 and the number 2 on a range of 10.000 cells. The... more

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Statistics

04/01/22

if P(E)= 0.3 and P(F)= 0.4 and P(EunionF) = 0.1 then P(E U F)=

The symbol for the union is the upside down U but I couldn't find it to type it. I am not sure what the formula for this problem is.

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Statistics

03/31/22

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

I think I know the answer I just want to go over it just to make sure that I am doing things correctly. I thought the answer is 30 percent but I am not sure how I am getting this answer.

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Statistics

03/31/22

Confidence Interval

Explain the confidence interval of the slope or b in a simple linear regression, positive vs negative and what this means

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Statistics

03/31/22

Intercept and linear regression

What happens to the intercept if you add variables to the regression model (increase, decrease, remain the same) and why?

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Statistics

03/31/22

probability statistics

The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 40 liters, and standard deviation of 11.6 liters.A) What is the probability that daily production... more

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Statistics

03/31/22

probability statistics

Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally... more

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Statistics

03/31/22

find the probability

Assume that when adults with smartphones are randomly selected, 49% use them in meetings or classes. If 25 adult smartphone users are randomly selected, find the probability that exactly 15 of... more

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Statistics

03/30/22

A random sample of 150 students has an average test score of 86.28. The standard deviation of the entire school is 10.3. Find the margin of error if c = 0.90.

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Statistics

03/30/22

I am confused solving this problem

A real estate agent claims that 62% of all private residences being built today are 3-bedroom homes. To test this claim, a large sample of new residences is inspected; the proportion of these... more

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Statistics Probability

03/29/22

Probability Statistics

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 45 ounces and a standard deviation of 5 ounces.Use the Empirical... more

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Statistics Probability

03/29/22

Help with statistics question

The probability density of a random variable X is given in the figure below.From this density, the probability that X > 1.72 or X < 0.14 is:

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Statistics

03/29/22

E and F are mutually exclusive events. P(E) = 0.5; P(F) = 0.4. Find P(E|F). (Enter your answer to one decimal place.) P(E|F)

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Statistics Probability Distributions

03/29/22

For a standard normal distribution, find: P(z < 2.85) Express the probability as a decimal rounded to 4 decimal places.

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Statistics Probability

03/29/22

A plane lands or takes off, on average once per 45 seconds at an airfield. Calculate what is the probability that in a random selected hour we notice:

1) At least 75 landings or take offs?2) Under 100 landings or take offs?

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Statistics

03/29/22

If one student is chosen at random, Find the probability that the student was full-time AND got a "B".

Giving a test to a group of students, the grades and class-taking status are summarized below A B C Total Full-time 2 18 3 23 Part-time 13 16 14 43 Total 15 34 17 66

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Please help me find How many of the 15 students do we expect to attend the festivities? (Round your answer to the nearest whole number.)

Which of the following correlation coefficient represents the most linear function? A 0.976 B 0.001. C- 0.002 D - 0989

What is the probability

Find Upper and Lower Bounds on CI

please help me find the standard deviation of this question

Please help me find p(X=x) and x*P(X=x) to complete the table

statistics chapter 11-13

statistics expected gain or loss

Find z such that 64% of the standard normal curve lies between −z and z. (Round your answer to two decimal places.)

Binomial Distribution: Standard Deviation, am I getting this wrong?

if P(E)= 0.3 and P(F)= 0.4 and P(EunionF) = 0.1 then P(E U F)=

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

Confidence Interval

Intercept and linear regression

probability statistics

probability statistics

find the probability

A random sample of 150 students has an average test score of 86.28. The standard deviation of the entire school is 10.3. Find the margin of error if c = 0.90.

I am confused solving this problem

Probability Statistics

Help with statistics question

E and F are mutually exclusive events. P(E) = 0.5; P(F) = 0.4. Find P(E|F). (Enter your answer to one decimal place.) P(E|F)

For a standard normal distribution, find: P(z < 2.85) Express the probability as a decimal rounded to 4 decimal places.

A plane lands or takes off, on average once per 45 seconds at an airfield. Calculate what is the probability that in a random selected hour we notice:

If one student is chosen at random, Find the probability that the student was full-time AND got a "B".

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