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Statistics Math

06/13/23

need help with this stat question please

"Mary has 25 products in her store. She wants to select 8 products to arrange in the store window. how many different combinations of products can Mary select?"I got 9.12 x 1023.Does that seem... more

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Statistics

06/12/23

Find the p-value

While her husband spent 2½ hours picking out new speakers, a statistician decided to determine whether the percent of men who enjoy shopping for electronic equipment is higher than the percent of... more

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Statistics

06/12/23

Find the P-value

A recent drug survey showed an increase in use of drugs and alcohol among local high school seniors as compared to the national percent. Suppose that a survey of 100 local seniors and 100 national... more

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Statistics Math

06/12/23

Ch 5, 6, 7 Questions 5

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.5 years, and standard deviation of 3.2 years.If you randomly purchase one item, what is the probability... more

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Statistics Math

06/12/23

Ch 5, 6, 7, Questions 4

A normal distribution has a mean of 98 and a standard deviation of 5. Find the z-score for a data value of 100. Round to two decimal places

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Statistics Math

06/12/23

Ch 5, 6, 7, Questions 3

The mass of a species of mouse commonly found in houses is normally distributed with a mean of 20.9 grams with a standard deviation of 0.12 grams.Round your answers to 3 decimals.a) 10% of all mice... more

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Statistics Math

06/11/23

Ch 5, 6, 7 Practice Test

A set of test scores are normally distributed with a mean of 69.3 and a standard deviation of 11.1 points. If the scores in the eleventh percentile and below will receive an F, what test score will... more

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Statistics

06/11/23

Statistics Ch. 10.3

Test the claim that the proportion of men who own cats is smaller than the proportion of women who own cats at the .10 significance level.The null and alternative hypothesis would be:H0: PM=PFH1:... more

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Statistics

06/11/23

Statistics Ch 5, 6, 7

Bus wait times are uniformly distributed between 8 minutes and 13 minutes. The unshaded rectangle below with area 1 depicts this. The shaded rectangle depicts the probability that a randomly... more

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Statistics

06/11/23

Tutoring with Wyzant

I am a doctoral student at Baylor University.I should have an account with Wyzant, but do not know how to access it.We are allowed five hours of tutoring free.I have not used my hours yet, but... more

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Statistics

06/10/23

confidence interval

To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and... more

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Statistics

06/10/23

Find the Standard Deviation

Scrapie is a degenerative disease of the nervous system. A study of the substance IDX as a treatment for scrapie used as subjects 20 infected hamsters. Ten, chosen at random, were injected with... more

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Statistics

06/09/23

The mean weight of 20 randomly selected newborn babies at a local hospital is 7.08 lbs and the standard deviation is 0.1 lbs. Assume the weight of newborn babies has approximately normal distribution.

The mean weight of 20 randomly selected newborn babies at a local hospital is 7.08 lbs and the standard deviation is 0.1 lbs. Assume the weight of newborn babies has approximately normal... more

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Statistics

06/09/23

A sector of a circle with diameter 10 feet and an angle of _ π 2 radians

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Statistics

06/08/23

Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores?

Pro golf scores are bell-shaped with a mean of 69 strokes and a standard deviation of 4 strokes. Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the... more

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Statistics

06/08/23

Calculate the 20% mean of this sample data list.

Calculate the 20% mean of this sample data list.{ 13, 20, 13, 17, 14, 20, 19, 19, 19, 21, 14 } Trimmed Mean = three decimals

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Statistics

06/07/23

Using Chebyshev's Rule, in what interval about the mean would you expect to find at least 89% of the prices?

The list prices of homes in a Central Ohio neighborhood have a mean of 168000 dollars and a standard deviation of 6000 dollars. The distribution is unknown. Using Chebyshev's Rule, in what interval... more

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Statistics

06/07/23

Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores?

Pro golf scores are bell-shaped with a mean of 69 strokes and a standard deviation of 4 strokes. Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores? more

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Statistics

06/07/23

Using the empirical rule, in what interval about the mean would you expect to find 68% of the weights?

Weights of Old English Sheepdogs are normally distributed with a mean of 59 pounds and a standard deviation of 4 pounds. Using the empirical rule, in what interval about the mean would you expect... more

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Statistics

06/07/23

Calculate the mode of the sample data set represent via distribution below.

Calculate the mode of the sample data set represent via distribution below. ClassesFrequency 6-10 9 11-15 8 16-20 6 21-25 11 26-30 7 31-35 10

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Statistics

06/07/23

Find the p value

The average work week for engineers in a start-up company is believed to be about 60 hours. A newly hired engineer hopes that it's shorter. She asks 10 engineering friends in start-ups for the... more

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Statistics

06/05/23

Normally distribution

A pharmaceutical company makes tranquilizers. It is assumed that the distribution for the length of time they last is approximately normal. Researchers in a hospital used the drug on a random... more

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Statistics

06/01/23

Speed of the stun gun projectile compared to a 90mph fastball. Same nearly flat trajectory…

How fast projectile from stun gun?…compared to 90mph fastball

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Statistics

05/31/23

Find the P-values:

Emissions of sulfur dioxide by industry set off chemical changes in the atmosphere that result in "acid rain". The acidity of liquids is measured by pH on a scale of 0 to 14. Distilled water has pH... more

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Statistics Psychology

05/30/23

Is there a significant difference between the two populations represented by these two samples? Use a two-tailed test with α = .01 (t critical = +/- 2.75)

n1=18, M1=42, SS1=398n2=16, M2=48.6, SS2=370

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need help with this stat question please

Find the p-value

Find the P-value

Ch 5, 6, 7 Questions 5

Ch 5, 6, 7, Questions 4

Ch 5, 6, 7, Questions 3

Ch 5, 6, 7 Practice Test

Statistics Ch. 10.3

Statistics Ch 5, 6, 7

Tutoring with Wyzant

confidence interval

Find the Standard Deviation

The mean weight of 20 randomly selected newborn babies at a local hospital is 7.08 lbs and the standard deviation is 0.1 lbs. Assume the weight of newborn babies has approximately normal distribution.

A sector of a circle with diameter 10 feet and an angle of _ π 2 radians

Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores?

Calculate the 20% mean of this sample data list.

Using Chebyshev's Rule, in what interval about the mean would you expect to find at least 89% of the prices?

Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores?

Using the empirical rule, in what interval about the mean would you expect to find 68% of the weights?

Calculate the mode of the sample data set represent via distribution below.

Find the p value

Normally distribution

Speed of the stun gun projectile compared to a 90mph fastball. Same nearly flat trajectory…

Find the P-values:

Is there a significant difference between the two populations represented by these two samples? Use a two-tailed test with α = .01 (t critical = +/- 2.75)

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