Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Hypothesis testing for population mean.

1.      Ztest- Used when making claims about the population mean (μ) and a simple random sample is obtained.  The test statistics is the sample mean. The test is to be used under any or all of the following conditions

a.    The sample is large (n is at least 30)

The population is normal and the population standard deviation is known.

2.      Ttest - Used when making claims about the population mean of a normal or near normal population, the population standard deviation is not known, and a simple random sample of small size (n < 30) is obtained.  The test statistics is, has a t-distribution with n-1 degrees of freedom.  

3.      Paired Ttest - Used when two observation are made on the same experimental unit to investigate whether the two observations are different.

4.      Chi-Square Test - Used to compare observed distribution with an assumed distribution for fit.  It is also used to test for independence between two variables.

5.      How do you set up a decision rule for p-value and a given significant level?

6.      When is a test said to be significant?

7.      How can you use a confidence interval to test a two-sided hypothesis?  First, to test a two-sided hypothesis at level of significance α, we can construct a confidence interval based on a confidence level of 1-α.  If the null value (the value used to set of the hypothesis) is found outside the interval, then we reject H0, otherwise we do not reject H0.

This wine stinks.  Sulfur compounds cause "off-odors" in wine. So winemakers want to know the odor threshold, the lowest concentration of a compound that the human nose can detect.  The odor threshold for DMS in trained wine testers is about 25 micrograms per liter of wine (µg/l).  The untrained noses of consumers may be less sensitive, however.  Here are the DMS odor thresholds for 10 untrained students:

31   31   43   36   23   34   32   30   20   24

Presume that the odor threshold for untrained noses is normally distributed with? = 7 µg/l.  Is there evidence that the mean threshold for untrained tasters is greater that 25µg/l?

 

1.      Based on the p-value and , the null hypothesis (Ho) is

a.      Rejected

b.      not rejected

c.       Not enough information to draw a conclusion

2.      Based on the above analysis (p-value and), we conclude that

a.      The mean threshold for untrained tasters is greater than 25

b.      The mean threshold for untrained tasters is not greater than 25

c.       We do not have enough information to draw a conclusion

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M920212

Have any Question? 


Related Questions in Statistics and Probability

Connie wants to have an annuity payment of 2000 at the end

Connie wants to have an annuity payment of $2,000 at the END of every three months. How much should she deposit now at 6% interest, compounded quarterly, to yield this payment for 3 years? (Use Table 12-2 in your text) $ ...

Consider the following two dynamic regression modelsmodel 1

Consider the following two dynamic regression models: Model 1 yt = αyt-1 + βxt + t Model 2 yt =γxt1-φL +t1-θL where L is the lag operator and α, β, γ, φ, and θ are parameters. Assume that t ∼ N(0, σ2) (not necessarily th ...

Imagine that your town or city has increased its nighttime

Imagine that your town or city has increased its nighttime police patrols to reduce crime. Design two quasi-experiments to determine whether this intervention has been effective, one that uses some variation of a nonequi ...

The percentage of people with advanced degrees is 165 on

The percentage of people with advanced degrees is 16.5% on average if 1000 people are randomly selected what is the probability that the percentage of these poeple with advanced degrees is between 17% and 18.5%?

In a recent survey of high school seniors a random sample

In a recent survey of high school seniors, a random sample of 1000 females showed that 650 were planning on pursuing a college degree, while a random sample of 1000 females showed that 600 were planning on pursuing a col ...

1 what aspects of data analysis can be performed by

1. What aspects of data analysis can be performed by computers, and what are the advantages of using them to do so? 2. Review the procedures used to verify that collected data are coded and entered correctly before they ...

Onenbspstudy based on responses 1014nbsprandomly

One study, based on responses 1,014 randomly selected teenagers, concluded that 39% of teenagers cite grades as their greatest source of pressure. Use a 0.05 significance level to test the claim that fewer than half of a ...

Records show that 13 of all college students are foreign

Records show that 13% of all college students are foreign students who also smoke. It is also known that 25% of all foreign college students smoke. What percent of the students at this university are foreign?

What are the key components of consideration that went into

What are the key components of consideration that went into forming the Texas Constitution?

Suppose that utility payoffs depend on decisions and states

Suppose that utility payoffs depend on decisions and states as shown in Table 1.3. Letp(θ1,),p(θ2)) denote the decision-makers subjective probability distribution over Ω = {θ1 ,θ2}. a. Suppose first that B = 35. For what ...

  • 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