1,010 Answered Questions for the topic Statistics Question

Statistics Question

12/19/14

what is the value of the correlation coefficient?
A researcher measures the relationship between narcissism and willingness to help. If SS_xy=240, SS_x=320, and SS_y=410, what is the value of the correlation coefficient?
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Statistics Question

12/15/14

Statistics Null and alternative hypothesis
A sociologist believes that women sleep longer per night on the weekend than men.Sixty onepeople were surveyed. The following summary statistics were determinedfrom the... more
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Statistics Question

12/15/14

Statistics Null and alternative hypothesis
Historically, the mean dollar spent for in-store retail purchases (charges) on the VistaCharge Card the day after Thanksgiving Day(BLACK FRIDAY) for customers who use theirVista Charge Card that... more
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Statistics Question Math Statistics Word Problem

12/14/14

Statistice help??? Confidence interval & sampling error.
A company surveyed 600 people for a new retirement plan. 235 employees prefered the new plan. What is the employee population proportion that would agree to the new plan? Find a confidence interval... more
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Statistics Question Statistics

12/12/14

Testing claim with hypothesis test and constructing confidence level with two sets of data?
In a randomized controlled trial in Kenya, 343 infants used bednets and 15 devloped Malaria. 294 infants did not use bednets and 27 devloped Malaria. With a significance level of 0.01, test the... more
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Statistics Question

12/11/14

Test Statistic Z-Value. Please help!
100 people in New York and 100 people from Chicago, were each asked "do you like your own cities style of pizza better than the other one?" The number of people that said yes in new york is... more
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Statistics Question

12/11/14

Need help for this exercise
  Please read the following narrative and answer the following questions:Researchers compared urinary bacteria levels of elderly women who drank 10 ounces of a juice drink containing cranberry... more
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Statistics Question

12/11/14

for the standard normal variable Z, find the number c such that P(-c<Z<z)=.74
for the standard normal variable Z, find the number c such that P(-c<Z<z)=.74
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Statistics Question Statistics Math Help Mathematics

12/08/14

Weights of a certain model of fully loaded gravel trucks follow a normal distribution with mean µ=6.4 tons and standard deviation s=0.3 ton.
Weights of a certain model of fully loaded gravel trucks follow a normal distribution with mean μ=6.4 tons and standard deviation σ=0.3 ton. What is the probability that a fully loaded truck of... more
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Statistics Question

12/07/14

there are 10 students
there are 10 students : 6 females and 4 males , in professor lee's statistic class. if he chooses 4 students whast the probability that (a) choosing 3 makes (b) at last three males, and (c) less... more
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Statistics Question

12/07/14

Develop a 95% confidence interval estimate for the proposition of all Chattannoga residents who voted for the Democratic Candidate.
In a random sample of 400 residents of Chattanooga, 320 residents indicated that they voted for the Democratic candidate in the presidential elections.
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Statistics Question

12/06/14

distance travelled per truck is normally distributed with a mean of 50.0 thousand kilometres and a standard deviation of 12.0 thousand kilometres.
A trucking company has determined that on an annual basis the distance travelled per truck is normally distributed with a mean of 50.0 thousand kilometres and a standard deviation of 12.0 thousand... more
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Statistics Question

12/05/14

Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test
Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test for the FDA. Please conduct this... more
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Statistics Question

12/05/14

a. Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test
Suppose the FDA wishes to conduct a hypothesis test to evaluate the null hypothesis that the population mean is 260 milligrams. Conduct this hypothesis test for the FDA. Please conduct this... more
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Statistics Question Statistics

12/02/14

Find the degrees of freedom for the F statistic and then use Table E to approximate the P-value
a. seven groups are being compared with 5 observations per group. the value of the f statistic is 2.69 b. five groups are being compared with 11 observations per group. the value for the f... more
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Statistics Question

12/02/14

I need the probability of a standard problem.
the mean of monthly rent is $2650. Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $2704?
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Statistics Question Normal Distribution

11/27/14

Need help.
The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon. (a) What... more
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Statistics Question

11/27/14

Need help.
The time required for an automotive center to complete an oil change service on an automobile approximately follows a normal distribution, with the mean of 17 minutes and a standard deviation of 2... more
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Statistics Question

11/26/14

Statistics Normal Distribution.
The average age of a passenger on the Euro rail passenger train is 29.4 years. If the distribution of ages isnormal and 20% of the passengers are older than 33.6 years old, find the standard... more
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Statistics Question

11/26/14

help me wit my statistics question
The weights of a set of boxes are normally distributed with mean 16g. and standard deviation 0.6g. If a box is selected at random, find the probability that its weight is more than 15.8g.
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Statistics Question

11/25/14

a exit poll surveyed 987 people anf found 654 of them have voted for drew kuomo. construct a90% confidence interval for the true proportion of voted for drew
a exit poll surveyed 987 people anf found 654 of them have voted for drew kuomo. construct a90% confidence interval for the true proportion of voted for drew Kuomo. Express your answer (x.x%,x.x%)
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Statistics Question

11/24/14

statistcs, correlation
The correlation between hours studied for Math class and Math grade for high school students is found to be about r = 0.75. Suppose we wish to use Math study hours x to predict Math grade y for... more
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Statistics Question

11/17/14

Statistics which t-test to use etc..
Q1 A liquid phase reaction: A → 2R was performed in two different reactors and the following results were obtained in repeated experiments: Reactor 1: Conversion of A (in %): 57.2, 53.1, 59.8,... more
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Statistics Question Statistics

11/13/14

Can they infer at the 5% significance level that sales increase during the campaign? What is the test statistic?
The general manager of a chain of fast food chicken restaurants wants to determine how effective their promotional campaigns are. In these campaigns "20% off" coupons are widely distributed. These... more
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Statistics Question

11/12/14

Statistical word problem
Suppose a mathematician computed the expected value of winnings for a person playing different games in a casino. What would you expect to be true for all expected values for these games?
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