How is the rejection region defined

Assignment Help Applied Statistics
Reference no: EM13850945

6 questions in math statistics. Must show all work for each. 

1.Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they feel about the President's handling of the crisis in the financial markets. The results show that 575 out of the 1280 people polled say they either "approve" or "strongly approve" of the President's handling of this matter. Based on the sample referenced above, find a 95% confidence interval estimate for the proportion of the entire voter population who "approve" or "strongly approve" of the President's handling of the crisis in the financial markets.
Now, here's an interesting twist. If the same sample proportion was found in a sample twice as large-that is, 1150 out of 2560-how would this affect the confidence interval? 

2.How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or in your area?

3.What is the difference between the 'null hypothesis' and the 'alternate hypothesis'?  

4.What are some tips for knowing 'how' to set up the two hypothesis?  

5.Is the 'claim' always the alternate hypothesis?  

6.When do we use a z-value rejection region when testing a claim about a population mean?  When do we use a t-value?

Reference no: EM13850945

What is the 5 stage lp formulation of this model

A computer services company sells computer services to industrial users. The company's analytic officer has predicted the need for growth to meet competitive pressures.  To im

Perform a two-tail test of the null hypothesis

Perform a two-tail test of the null hypothesis H0: β2 = 0 against the alternative H1: β2 ≠ 0 with α = 0.05. Find the value of the t-statistic and the associated critical valu

What is the reported level of significance

Write an appropriate null hypothesis for this analysis - what is the mean number of days it takes for symptoms to cease for each brand and what is the standard deviation of th

Forecasting with time series analysis

Develop a sales forecast for each store for December Plot the data for each store.Use data in table.

The sample mean is contained in the interval

A delivery truck manager takes a sample of 25 delivery trucks and calculates the sample mean and sample standard deviation for the cost of operation. He asks an employee to co

For the daily lottery game in a particular state

For the daily lottery game in a particular state, participants select 4 numbers between 0 and 9. A number cannot be selected more than once, so a winning ticket could be 3071

The makers of compute

The makers of Compute-All know that in the past, 40% of their sales were from people under 30 years old, 45% of their sales were from people who are between 30 and 50 year

What was the cumulative incidence of tb over the year

What was the prevalence of TB in the screened community on January 1st - what was the prevalence of TB on June 30th and calculate the prevalence of serious defects in this pop

Reviews

Write a Review

 
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