Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Objective type problems based on the Confidence interval and regression.

1) Mean=63.6 Standard deviation=2.5 If 36 data points are randomly selected, find the probability that the mean is less than 64.
a. .3815  

b. .8315  

c. .1685  

d. .5183  

2) Express the confidence interval .600, .800 in the form p hat plus and minus E.

a. .700 plus and minus .005  

b. .700 plus and minus .500  

c. .700 plus and minus .010  

d. .700 plus and minus .100  

3) Find the 95% confidence interval of the population mean, given n=90, x bar=66.2 and standard deviation=3.4.

a. 34.5, 35.5  

b. 33.1, 34.5  

c. 60.0, 70.0  

d. 65.5, 66.9  

4) 1,025 randomly selected adults were surveyed and 29% of them said they used the internet for shopping. Find a 99% confidence interval for the proportion of adults who use the internet for shopping.

a. .253, .326  

b. .200, .300  

c. .203, .303  

d. .214, .316  

5) Claim u=75. Sample data n=15, x bar=66, s=12. Sigma = 14. Which distribution should be used to test the claim that the population mean=75.

a. Student t  

b. Normal  

c. Binomial  

d. None of these  

6) The mean lifespan of desktop PCs is less than 7 years. Assume data come from a normal population. n=21, x bar=6.8, s=2.4, alpha=.05 Compute the critical t value of the data.

a. +1.725  

b. -1.645  

c. -1.725  

d. +1.645  

7) Find the equation of the regression line from the following data: x: 1, 1, 2, 5, 3 y: 0, 2, 2, 3, 5

a. y hat = .333 + .667x  

b. y hat = .857 + .643x  

c. y hat = .643 + .857x  

d. y hat = 10 + x  

8) Find the equation of the regression line. x: 0, 2, 1, 4, 8 y: 6, 5, 4, 0, 6

a. y hat = 2.275 - 0.025x  

b. y hat = 4.725 + 0.065x  

c. y hat = 4.275 - 0.025x  

d. y hat = 3.275 - 0.035x

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M922399

Have any Question? 


Related Questions in Statistics and Probability

What have you learned about the city-states in greece that

What have you learned about the city-states in Greece that you can apply to creating contact between your band of survivors and other survivor groups? Does a city-state work for your group or do you want to form another ...

Asume that you plan to use a significance level of alpha

Assume that you plan to use a significance level of α = 0.05 to test the claim that p1 = p2. Use the given sample sizes and numbers of successes to find the P-value for the hypothesis test. n1 = 50 n2 = 50 x1 = 8 x2 = 7

Consider the following gameyou pay 100 and a fair 6-sided

Consider the following game. You pay $1.00 and a fair 6-sided die is rolled. If the roll is 1 or 3, then you get your dollar back and the game ends. If the roll is 5, you get $2.00 back (your dollar plus an additional do ...

A repeated-measures experiment comparing only two

A repeated-measures experiment comparing only two treatments can be evaluated with either a t statistic or an ANOVA. As we found with the independent-measures design, the t test and the ANOVA produce equivalent conclusio ...

In a normal distribution what percentage of scores fall

In a normal distribution, what percentage of scores fall between -1 and +1 standard deviations from the mean? Between the mean and -2 standard deviations ? Between the mean and +3 standard deviations?

A multiple-choice test consists of 7 questions each

A multiple-choice test consists of 7 questions. Each question has answer choices of a, b, c, and d, and only one of the choices is correct. If a student randomly guesses on each question, what is the probability that she ...

In the unit 4 discussion you were asked to create a

In the Unit 4 Discussion you were asked to create a research question and then convert that question into a null hypothesis and alternative hypothesis. You also determined if your alternative is one-tailed or two-tailed. ...

1 prove that every complete irreflexive and transitive

1. Prove that every complete, irreflexive, and transitive relation is asymmetric: if x ≠ y, then x > y if and only if y x. 2. Prove that the Gale-Shapley algorithm for finding a stable matching satisfies the following pr ...

Suppose we obtain a random sample of 80 champaign voters of

Suppose we obtain a random sample of 80 Champaign voters, of which 55 support marijuana legalization. We also obtain a random sample of 100 Urbana voters, of which 75 support marijuana legalization. Let pC be the true pr ...

Plot four different regression graphs x v y tomatometer v

Plot four different regression graphs (X v Y): Tomatometer v Audience, Budget v Gross, Budget v Tomatometer, Audience v Gross and find the best-fit line equation and correlation coefficient (r-value) for each one. X repr ...

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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