Pooled variance-interval data and hypothesis testing

Assignment Help Basic Statistics
Reference no: EM13110263

1. What is pooled variance and why is it important?

2. Explain what interval data is and give an example:

3. Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:

4. Write the formula for pooled variance.

5. Please analyze the following data using the T-test for Unpaired data:

A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores and found the mean score for girls to be xbar1 = 25 and the mean score for boys to be xbar2 = 26. The standard deviation for the girls is s1 = 2.2 and for the boys the standard deviation is s2 = 3.4. Is the school district correct in assuming the girls are equal in performance to boys. They are 95% sure their assumption is correct.

Reference no: EM13110263

Questions Cloud

Determining reversal : In the 2000 football season, 247 plays were reviewed by officials using instant video replays, and 83 of them resulted in reversal of the original call.
Discuss how team basics can be applied in real situations : Discuss how the team basics can be applied in real situations where team thinking becomes important.
Proportion in a stem cell survey : Stem Cell Survey - Adults were randomly selected for a Newsweek poll. They were asked if they "favor or oppose using federal tax dollars to fund medical research using stem cells obtained from human embryos.
Determine which has higher coefficient of variation : Stock 2 closing price over last month has the mean of 59.2 and the standard deviation of 3.3. Determine which has higher coefficient of variation?
Pooled variance-interval data and hypothesis testing : What is pooled variance and why is it important? Explain what interval data is and give an example: Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
Describe sameday delivery manufacturing process : Describe FedEx Office and SameDay delivery manufacturing process and scheduling approach. You are consulting with a company that is failing. It seems the CEO (recently fired) paid no attention to the board of directors.
Inferences about two proportions : A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2823 occupants not wearing seat belts, 31 were killed. Among 7765 occupants wearing seat belts, 16 were killed.
Determine monetary multiplier : The public's preference is to hold their money as half cash, half demand deposit. Reserve requirement is 25%. Determine monetary multiplier.
Hypothesis testing-proportion of survey response : A total of 61,647 people responded to an Elle/ MSNBC.com survey. It was reported that 50% of the respondents were women and 50% men.

Reviews

Write a Review

 

Basic Statistics Questions & Answers

  Hypothesis testing-bio statistics

An investigator wishes to study the effect of cigarette smoking on the development of myocardial infarction (MI) in women. A sample of 2000 disease-free current smoking women and 100 disease-free ex-smoking women

  Observational study designs-validity and feasibility

Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.

  Pearson coefficient-scatterplot interpretation

Is there a method which is accepted across industries for determining the minimum size of valid sample? N>50 +(8m aka 8 times the number of independent variables)

  Determining probability that 3 roll are defected

Determine the probability of having more than 3 defects in a roll?

  Testing of homogeneity of variance

Using an alpha of .05, what can you conclude about homogeneity of variance from the output? Word process your responses on the SPSS output pages.

  Estimate the proportion of students who consume coffee

How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.

  Solve the equations using linear algebra

Solve the equations using linear algebra

  Computing random sample and confidence interval

You are given the sample mean and the sample deviation, Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?

  Probability of random sample-sample mean sat score

What is the probability a random sample of 75 students will provide a sample mean Sat score within 20 of the population mean?

  Chi square test for association

The newspaper has charged that your police department responds more slowly to 911 calls in poor neighborhoods than in more wealthy ones.

  Mean length of commercials

The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.

  Estimation of standard error

Compute the standard error of estimate, and interpret its meaning.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd