07/12/20

Sample Hypothesis Test
You wish to test the following claim (Ha) at a significance level of α=0.05.      Ho:p1=p2      Ha:p1>p2You obtain 62.7% successes in a sample of size n1=201 from the first population. You... more
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07/12/20

f(x)=2x+5 and g(x)=x^2-c. What is c if g(2f(x))=16x^2+80x+97
A) 1B) 2C) 3D) 4
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07/12/20

A distribution of values is normal with a mean of 192.1 and a standard deviation of 95.8. Find P42, which is the score separating the bottom 42% from the top 58%. P42 =

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07/12/20

Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P ( − b < z < b ) = 0.199 , find b. b =

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07/12/20

A population of values has a normal distribution with μ = 140.6 and σ = 40.6 . You intend to draw a random sample of size n = 232 . What is the mean of the distribution of sample means? μ ¯ x =
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07/12/20

For a standard normal distribution, given: P(z < c) = 0.6838 Find c.
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07/12/20

A particular fruit's weights are normally distributed, with a mean of 415 grams and a standard deviation of 31 grams. The heaviest 4% of fruits weigh more than how many grams?
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07/11/20

Chapter 7 Estimating Parameters

Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 98​% confidence interval estimate of the mean amount of mercury in the... more
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07/11/20

What is the margin of error and what is the confidence interval

A survey of 1,026 people asked: “What would you do with an unexpected tax refund?” Forty-seven percent responded that they would pay off debts. a. At 95% confidence what is the margin of error?b.... more
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07/11/20

A random sample of 80 observations results in 50 successes.

A. Construct the 95% confidence interval for the population proportion of successes. B. Construct the 95% confidence interval for the population proportion of failures.
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07/11/20

Using a confidence coefficient of 0.90, derive the interval estimate for homeowners that hold a home equity loan.

In a recent poll of 2,000 homeowners, 1 in 8 homeowners reports having a home equity loan that they are currently paying off. Using a confidence coefficient of 0.90, derive the interval estimate... more
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07/11/20

Confidence Intervals
Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 131 with 44% successes. Enter your answer as a tri-linear inequality using... more
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07/11/20

statistics, mth
the effectiveness of a blood-pressure drug is being investigated. an experimenter finds that, on average , the reduction in systolic blood pressure is 33.5 for a sample of size 25 and standard... more
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07/11/20

statistics, mth
if n=20, x=43, and s=9, construct a confidence interval at a 98% confidence level.
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07/10/20

College students average 7.6 hours
College students average 7.6 hours of sleep per night with a standard deviation of 40 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more... more
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07/09/20

How can I solve this? And what does it mean?
Given the circle (x-6)^2 + (y+7)^2=225. Determine the center, length of the radius, and exact Circumference.
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07/09/20

Co-Ordinate Geometry (Circumcentre)
When solving, is there certain points to use to get the correct answer ti find the circumcentre of a triangle with given vertex points? Say for example, point A is (0,0), point B is (4.0) and point... more
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07/08/20

Standard deviation of return on investment average probability

in current year companies have an average return on investment of 12.8% and standard deviation of return is 3.2%. Average return is normally distributed. What is the probability that a random... more
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07/08/20

I just need help please.
1.To compare the effects of an oral antibiotic on subjects suffering from a chronic bacterial infection, we conduct a matched-pair study, matching subjects who are treated with the antibiotic to... more
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07/08/20

Conditional Probability & Independence
Let E and F be events with P(E) = .4, P(F) = .8, and P(E | F) = .375. What is P(E ∩ F) ?
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07/08/20

Rectangle Math Question
A rectangle is 8 inches longer than twice the width. If the width doubled and the length is decreased by 4 inches, a new rectangle is formed. Find the dimensions of the original rectangle if the... more
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07/08/20

Breakfast Cereal Math Question
A grocer wants to make a natural breakfast cereal mix that he will sell for $3.75 per kilogram by mixing 15 kilograms of dried fruit worth $9 per kilogram with oat cereal worth $2 per kilogram. How... more
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07/08/20

What is the value of tan(theta) on an interval?
When (π / 2) < theta < (3π / 4),What is the value of tan(theta)?
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07/08/20

Geometry question
Given isosceles trapezoid ABCD with BA / / CD . Determine the perimeter of isosceles trapezoid ABCD in exact form when BC=4 and BA=9. (BC is sort of a hypotenuse for the trapezoid by the way). and... more
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07/08/20

The lines represented by the equations 2 y + 4 x = 2 2y+4x=2 and y = − 2 x + 6 y=−2x+6 are
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