09/07/22

#### A certain standardized​ test's math scores have a​ bell-shaped distribution with a mean of 525 and a standard deviation of .119 Complete parts​ (a) through​ (c).

A certain standardized​ test's math scores have a​ bell-shaped distribution with a mean of 525 and a standard deviation of 119. Complete parts​ (a) through​ (c).Question content area bottomPart... more

08/24/22

#### Let Z be a random variable with a Standard Normal distribution (

Let Z be a random variable with a Standard Normal distribution (). Calculate the following probability. Include all four decimal places in your answer. p(z>−1.2)=

08/24/22

#### Let Z be a random variable with a Standard Normal distribution (mu equals 0 comma space sigma equals 1). Calculate the following probability. Include all four decimal places in your answe

Let Z be a random variable with a Standard Normal distribution (). Calculate the following probability. Include all four decimal places in your answer.

08/21/22

#### The number of cars washed in a certain car wash station is a Poisson random variable with a mean of 6 cars per hour

(a) What is the probability that next car arriving to this station will wait less than 45 minutes? (b) What is the probability that at least 1 cars will be washed in 30 minutes period?

08/21/22

#### The number of customers arriving per hour at a certain automobile service facility is assumed to follow a Poisson distribution with λ = 7 .

(a) Compute the probability that more than 10 customers will arrive in a 3-hour period. (b) What is the mean number of arrivals during a 4-hour period?

08/17/22

#### Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 368 with 75 successes

Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 368 with 75 successes. Enter your answer as a tri-linear inequality using... more

08/17/22

#### Assume that a sample is used to estimate a population proportion p.

Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval for a sample of size 234 with 11% successes. Enter your answer as an open-interval (i.e.,... more

08/17/22

#### Section 8.3:Confidence Intervals (Proportions)

We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 83 had kids. Based on this, construct a 90% confidence interval for the... more

08/10/22

#### Probability &statistics

News reports tell us that the average American is overweight. Many of us have tried to trim down to our weight when we finished high school or college. And, in fact, only 20% of adults say they do... more

08/03/22

#### Hypothesis Testing - Power of Test

Suppose we are going to test null hypothesis whether the mean height of student grade 10is 115cm against the alternative hypothesis as µ > 115 cm. Assuming that the height ofthe student is... more

07/31/22

#### In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a

In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 54.3 inches, and standard deviation of 2.4... more

07/29/22

In a recent Super Bowl, a TV network predicted that 74 % of the audience would express an interest in seeing one of its forthcoming television shows. The network ran commercials for these shows... more

05/08/22

#### Given the sample: 6, 8, 13, 10, 7, x, and knowing that the median is equal to 9. Find the possible values of x

Given a sample: 6, 8, 13, 10, 7, x and knowing that the median is equal to 9. Find the possible values of x.The answer is x≥10

05/08/22

#### Statistics and probability

The age of children in kindergarten on the first day of school is uniformly distributed between 4.86 and 5.78 years old. A first time kindergarten child is selected at random. Round answers to 4... more

01/17/21

#### Determine the mean of the weight (in ounces) of the contents of the small gift box.

A candy manufacturer is marketing a small gift box containing one nut cluster bar and one piece of fudge. The manufacturing process for each candy is designed so that the mean weight of the nut... more

01/15/21

#### statistics multiple variations

Births are approximately Uniformly distributed between the 52 weeks of the year. They can be said to follow a Uniform distribution from 1 to 53 (a spread of 52 weeks). Round answers to 4 decimal... more

01/15/21

#### statistics question referecing minutes

The lengths of a professor's classes has a continuous uniform distribution between 49.2 min and 55.5 min. One class is randomly selected.If P(x > c) = 0.599 , find c.c =  minutes(Report answer... more

01/13/21

#### DBRHNLL8@yahoo.com

he method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal... more

01/13/21

#### Question on Sample Proportion

In a large high school, 37% of the teachers believe that five minutes is not enough to time for students to change classes. However, 89% of students believe that five minutes is not... more

01/13/21

#### dbrhnll8@yahoo.com

From the distribution table, find the column heading for c = 0.950 and read down the column until you reach the entry in the row headed by d.f. = 25. The intersection of the column and row in the... more

12/17/20

#### Suppose the number of presents that Santa Clause leaves under Christmas trees is Poisson distributed with a mean of 4.7 presents per house.

Suppose the number of presents that Santa Clause leaves under Christmas trees is Poisson distributed with a mean of 4.7 presents per house.A) Find the probability that he leaves exactly five... more

06/03/20

#### response rate with a probability of 0.90 that the error estimation is less than 0.06?

Suppose one of the executives would like to estimate the response rate for another welcome screen format. How many web users should be selected for the survey if the executive wishes to estimate... more

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