Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

problem: Which of the following statements are correct interpretations of a 95% confidence interval for μ?

(a) 95% of the observations in the sample will be contained in the confidence interval.

(b) 95% of the population will be contained in the confidence interval.

(c) 95% of the sample means will be contained in the confidence interval.

(d) Before the random sample was taken, there was a 95% probability of getting a sample which would give a confidence interval which contained μ. Thus, we are 95% confident our intervalcontains μ.

(e) 95% of the population means will be contained in the confidence interval.

(f) If repeated samples were taken, we would expect that 95% of the confidence intervals would contain μ and 5% would not.

problem: In a certain lake a limnologist wishes to estimate the proportion of lake trout with lamprey scars.

(a) How large of a random sample should be taken if the limnologist has no prior knowledge of the true proportion, but wants the bound to be within 0.04 with 90% confidence?

(b) How large should the sample be if the limnologist knows the true proportion does not exceed 0.20?

(c) If the limnologist caught 326 lake trout, and 47 had scars, find out a 95% confidence interval for the true proportion of lake trout with lamprey scars.

problem: Obtain the critical value (or values) for a hypothesis test for the mean if you conduct:

(a) an upper tail “z” test at the 1% level of significance.

(b) a two-tailed “z” test at the 1% level of significance.

(c) a lower tail “z” test at the 5% level of significance.

(d) a two-tailed “z” test at the 5% level of significance.

(e) an upper tail “z” test at the 10% level of significance.

(f) a upper tail “t” test with 17 d.f. at the 5% level of significance.

(g) a two-tailed “t” test with 17 d.f. at the 5% level of significance.

(h) a lower tail “t” test with 6 d.f. at the 1% level of significance.

(i) a two-tailed “t” test with 6 d.f. at the 10% level of significance.

(j) an upper tail “t” test with 6 d.f. at the 5% level of significance.

problem: A subject is asked to pick the suit of a card that she does not see, picked at random from a standard deck of playing cards. If the subject has no extra-sensory powers (ESO) her guesses should be correct, on average, 1 in 4 times. However, if she has ESP then the proportion of correct guesses should be better than 1 in 4.

(a) If the subject gets the suit correct 120 times in 400 trials, test (at the 5% level of significance) the statistical evidence that the subject might have ESP.

(b) find out the p-value for the test statistic value in (a) and interpret it.

problem: A study looked at the relationship between coronary heart disease (CHD) and coffee consumption in a group of 40–55 year old men. Among the 790 heavy coffee drinkers (at least 100 cups per month), there were 38 CHD cases. Among the 928 moderate and non-drinkers (less than 100 cups per month), there were 39 CHD cases.

(a) Test the hypothesis that the rate of CHD is higher for heavy coffee drinkers at the 5% level of significance.

(b) Obtain the p-value for the value of the test statistic in (b).

(c) What would the p-value be if the hypothesis to be tested was simply that the rate of CHD differs between the two groups?

(d) Obtain a 95% confidence interval for the difference in the population proportions of CHD cases between the two categories of coffee drinkers.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M9273

Have any Question? 


Related Questions in Statistics and Probability

1 explain the difference between rejecting and failing to

1. Explain the difference between rejecting and failing to reject the null hypothesis. In which case does a researcher conclude that the independent variable has an effect on the dependent variable? 2. Distinguish betwee ...

A family is relocating from st louis missouri to california

A family is relocating from St. Louis, Missouri, to California. Due to an increasing inventory of houses in St. Louis, it is taking longer than before to sell a house. The wife is concerned and wants to know when it is o ...

Given a stable matching of n men and n womena is it

Given a stable matching of n men and n women, (a) Is it possible to find three pairs such that if the matching among them is changed, each man will be matched to a woman whom he prefers, and each woman will be matched to ...

Roger reports i ascribe probability 03 to the philadelphia

Roger reports: I ascribe probability 0.3 to "the Philadelphia Phillies will win the World Series next year, Chris ascribes probability 0.4 to their winning the World Series and to me ascribing probability 0.4 that they w ...

Many grocery stores and large retailers such as wal-mart

Many grocery stores and large retailers such as Wal-Mart and K-Mart have installed self checkout systems so shoppers can scan their own items and cash out themselves. How do customers like this service and how often do t ...

Resource reservation protocol rsvp was originally designed

Resource Reservation Protocol (RSVP) was originally designed to establish signaling links for stationary networks. RSVP was applied to mobile wireless technology. A simulation study revealed that the transmission delay ( ...

Using the table of random numbers in appendix a-1 draw a

Using the table of random numbers in Appendix A-1, draw a stratified random sample of 10 boys and 10 girls from the following population: Ed Dale Eleanor Carlos Betsy Elisha Kevin Collin Raji Chris Milou Richard Tom Ryan ...

The course text notes that tensions and differences in the

The course text notes that tensions and differences in the 1770s led to the American Revolution that eventually produced independence for the United States from Great Britain. When the War for American Independence broke ...

A drug company wants to analyze if its new marketing

A drug company wants to analyze if its new marketing strategy adopted last year is successful is increasing sales. It randomly chooses 49 drugs from its list of products. For each drug, it computes the sales (in million ...

The mean number of medicine taken by a random sample of 26

The mean number of medicine taken by a random sample of 26 patients has a standard deviation of 3.1 medications. Assume the population is normally distributed Construct a 99% confidence interval for the population standa ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen