11/28/20

A researcher hypothesizes that children from the South weigh less (because they spend more time outside) than the national average. Identify H0 and Ha. Is this a one- or two-tailed test?

Probability - Binomial Distribution

It has been found that 80% of all printers used operate correctly at the time of installation. A seller sells 10 units during a month.1)find the prob.that at least 9 of the printers operate... more

07/30/19

Create a pie chart from distinct values in one column by grouping data in Excel?

I have an Excel document containing information from a survey. I want to create a pie chart over location (countries).How can I make Excel group all the distinct values together and then display... more

05/28/19

Hello, I wasn't not sure how to solve this at all. If it's possible could you also show step by step. Thank You!

35. Find the distance around the earth at the equator if the radius of Earth is 6,400 kilometers. a. 1.28 x 108 km b. 20,096 km c. 40,192 km d. 80,384 km I kept getting the answer as 20,106.I did... more

05/13/19

Smith Engineering is in the process of reviewing the salaries of their surveyors. During this​ review, the company found that an experienced surveyor can survey a roadbed in 6 hours.

An apprentice surveyor needs 9 hours to do the same stretch of road. With both how long it takes them to complete the job.

04/15/19

90 95 99 rule and percents

Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with µ=111 and σ=21 .Enter the score which marks the lowest 25 percent of the... more

04/14/19

Horizontal Height in a Circle in terms of Time

Background: a Ferris Wheel has a diameter of 135 feet and a maximum height of 150 feet. Its ride duration is 10 minutes and it makes two complete rotations in this time. Assume that at time t = 0,... more

04/12/19

how to find Standard Deviation from a percentile range

Suppose a normal model with a mean of 60 units. What is the standard deviation if 90% of production is at most 100 units?

04/12/19

The weight (in pounds) for a population of school-aged children is normally distributed with a mean equal to 121 ± 24 pounds (μ ± σ).

Suppose we select a sample of 100 children (n = 100) to test whether children in this population are gaining weight at a 0.05 level of significance.A) What is the critical value for this test?B)... more

Statistic confidence interval

The head of maintaince at xyz rent a car believes that the mean number of miles between services is 4959. Miles. With a standard deviation of 448 miles. If he is correct what is the probability... more

04/05/19

probability help me

In an inequality a>=b the variables a and b are replaced by randomly selected single-digit natural numbers. Find the probability that the resulting inequality is correct.?

04/05/19

A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 27 weeks.

Assume that for the population of all unemployed individuals the population mean length of unemployment is 27 weeks and that the population standard deviation is 3.5 weeks. Suppose you would like... more

04/02/19

04/01/19

Statistics Probability Question

An elevator has a placard stating that the maximum capacity is 2475 lb-15 passengers. So, 15 adult male passengers can have a mean weight of up to 2475/15= 165 lbs. If the elevator is loaded with... more

04/01/19

Let X have a uniform distribution on the interval (6, 13). Find the probability that the sum of 2 independent observations of X is greater than 20.

Let X have a uniform distribution on the interval (6, 13). Find the probability that the sum of 2 independent observations of X is greater than 20.

03/29/19

Area between z = -1.5 and z = 2.5.

Find the area under the standard normal curve between z = -1.5 and z = 2.5.

03/28/19

Algebra Question

find the dimensions of a rectangle whose length is a foot longer than twice its width and whose perimeter is 50 feet

03/27/19

In which rule for charitable giving is the donation amount certain to change by a constant percent rate from one year to the next?

In which rule for charitable giving is the donation amount certain to change by a constant percent rate from one year to the next? A. Every year donate \$100 more than the amount donated the... more
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