Newest statistics Questions | Wyzant Ask An Expert

12/16/23

statistics and probability

A researcher is investigating the effect of a new exercise program on weight loss. The null hypothesis is that the new exercise program does not lead to more weight loss than a standard exercise... more

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Statistics Math Probability

12/16/23

hypothesis stats and proba

A company is testing a new product to see if it is more effective than their current product. The null hypothesis is that the new product is not more effective than the current product, while the... more

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Statistics

12/15/23

The television show Degenerate Housewives has been successful for many years.

That show recently had a share of 18, meaning that among the TV sets in use, 18% were tuned to Degenerate Housewives. Assume that an advertiser wants to verify that 18% share value by conducting... more

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Statistics

12/15/23

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs

The distribution of the number of daily requests is bell-shaped and has a mean of 48 and a standard deviation of 7. Using the empirical rule (as presented in the book), what is the approximate... more

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Statistics Math

12/15/23

URGENT!!! PLEASE:If n=21, x bar=41, and s=6, construct a confidence interval at a 99% confidence level. Give your answers to one decimal place.

If n=21, x bar=41, and s=6, construct a confidence interval at a 99% confidence level. Give your answers to one decimal place. < μ <

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Statistics

12/13/23

Suppose that IQ scores have a bell-shaped distribution with a mean of 95 and a standard deviation of 16 . Using the empirical rule, what percentage of IQ scores are between 79 and 111 ?

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Statistics Math

12/12/23

Many investors and financial analysts believe the Dow Jones Industrial Average

(DJIA) gives a good barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis... more

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Statistics Math

12/12/23

The amounts of nicotine in a certain brand of cigarette are normally distributed

with a mean of 0.896 g and a standard deviation of 0.329 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a... more

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Statistics Math

12/12/23

Giving a test to a group of students, the grades and gender are summarized below

A B C Total Male 13 7 15 35 Female 19 2 20 41 Total 32 9 35 76 If one student is chosen at random, Find the probability that the student got an A: Find the probability that the student was male... more

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Statistics Math

12/11/23

You are studying two species of wasp. You are interested in the sterile, worker wasps.

You are studying two species of wasp. You are interested in the sterile, worker wasps. You record the lifespan (in days) of a random sample of wasps from each population.Population 1:... more

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Statistics Math

12/11/23

The grade point average of four randomly selected college students is recorded at the end of the fall and spring semesters of their senior year, as follows:

Student 1 2 3 4 Fall 1.3 2.2 1.9 2.1 Spring 1.1 1.3 1.2 1.8 Construct a 90% confidence interval for the mean difference in GPA. Round your answers to three decimal places,... more

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Statistics

12/10/23

A binomial probability experiment is conducted with the given parameters. Compute the probability of x successes in the n independent trials of the experiment.

n=9, p=0.4, x<_3The probability of x<_3 successes is ?

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Statistics

12/09/23

Business Statistics

A certain disease has an incidence rate of 0.4%. If the false negative rate is 5% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the... more

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Statistics Math

12/09/23

Suppose that the mean age of Mount Sac juniors is 20 years with a standard deviation of 5 years

And, the mean age of CSUF juniors is 21 years with a standard deviation of 4. Also, assume that the population ages are normally distributed. Hint: the conditions are met to use the normal model -... more

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Statistics Math

12/09/23

A sample of = 21 of juniors at PSU found a mean age of 23 years

A sample of n1 = 21 of juniors at PSU found a mean age of 23 years. A sample of n2 = 20 juniors at OSU found a mean age of 22 years. The population ages are normally distributed and o1 = 2 o2 =... more

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Statistics

12/09/23

Business statistics

A certain disease has an incidence rate of 0.7%. If the false negative rate is 5% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the... more

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Statistics

12/09/23

Business statistics

fill in the missing values for this ANOVA summary table: S.S. d.f. M.S. F Between 352.773 3 ? ? Within ? ? ? TOTAL 1891.773 30

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Statistics

12/09/23

Business statistics

A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y).The results of the regression... more

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Statistics

12/09/23

Business statistics

Based on the data shown below, calculate the regression line (each value to two decimal places)y = _____ x... more

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Statistics

12/08/23

Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 164 with 43.3% successes.

Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 164 with 43.3% successes. Enter your answer as a tri-linear inequality... more

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Statistics

12/08/23

For a confidence level of 98% with a sample size of 18, find the critical t value.

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Statistics

12/08/23

In a sample of 280 adults, 160 had children. Construct a 95% confidence interval for the true population proportion of adults with children. Give your answers as decimals, to three places

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Statistics

12/08/23

Business statistics

Fill in the missing values for this ANOVA summary table: S.S. d.f M.S. F Between 5914.608 6 ? ? Within ? ? ? TOTAL 11134.608 51 The ones without the question marks I don't need.

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Statistics

12/06/23

Statistics effects size rosenthal

Hello. I am curious about the effect size, Rosenthal’s r. I understand it shows the strength of an effect. I am confused about its relationship with persons r. For example if I am comparing... more

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Statistics

12/05/23

Express the confidence interval 32.6% +- 7.1% in interval form. Express the answer in decimal format (do not enter as percents).

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Answers •1

statistics and probability

hypothesis stats and proba

The television show Degenerate Housewives has been successful for many years.

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs

URGENT!!! PLEASE:If n=21, x bar=41, and s=6, construct a confidence interval at a 99% confidence level. Give your answers to one decimal place.

Suppose that IQ scores have a bell-shaped distribution with a mean of 95 and a standard deviation of 16 . Using the empirical rule, what percentage of IQ scores are between 79 and 111 ?

Many investors and financial analysts believe the Dow Jones Industrial Average

The amounts of nicotine in a certain brand of cigarette are normally distributed

Giving a test to a group of students, the grades and gender are summarized below

You are studying two species of wasp. You are interested in the sterile, worker wasps.

The grade point average of four randomly selected college students is recorded at the end of the fall and spring semesters of their senior year, as follows:

A binomial probability experiment is conducted with the given parameters. Compute the probability of x successes in the n independent trials of the experiment.

Business Statistics

Suppose that the mean age of Mount Sac juniors is 20 years with a standard deviation of 5 years

A sample of = 21 of juniors at PSU found a mean age of 23 years

Business statistics

Business statistics

Business statistics

Business statistics

Assume that a sample is used to estimate a population proportion p. Find the 80% confidence interval for a sample of size 164 with 43.3% successes.

For a confidence level of 98% with a sample size of 18, find the critical t value.

In a sample of 280 adults, 160 had children. Construct a 95% confidence interval for the true population proportion of adults with children. Give your answers as decimals, to three places

Business statistics

Statistics effects size rosenthal

Express the confidence interval 32.6% +- 7.1% in interval form. Express the answer in decimal format (do not enter as percents).

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