Computing the critical z value

Assignment Help Basic Statistics
Reference no: EM13111905

Please help me solve the following, I need the steps so that I can do them myself. Let me know how many credits will be required.

1.) Find the critical z value, assume that the normal distribution applies.

alpha = 0.005; H1 is p not equal 0.20

2.) In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the result suggest that fewer job applicants now use drugs?

3.) Claim: The mean life span of desktop PC's is less than 7 years. Sample data: n=21, mean of the value = 6.8 years, s = 2.4 years. The significance level is alpha = 0.05.

Find the null and alternative hypothesis, test statistic, critical value, and state the final conclusion. Assume that a simple random sample has been selected from a normally distributed population

Reference no: EM13111905

Questions Cloud

Compute the amount of calcium carbonate : The average pH of precipitation in rural areas is 5.80. Assuming that the pH is controlled by the carbonate system, i.e., no anthropogenic acid gases are present in the atmosphere.
Determine someone with same birtheday as yours : Determine the average number of people you should ask in order to determine someone with same birtheday as yours.
Identify critical region and critical values : Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
Calculating charge balance : The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would make the cations and anions balance?
Computing the critical z value : In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the ..
What happens to the average speeds of the particles : What happens to the average speeds of the particles in a gas when one increases that gas's temperature?
Is series judge successful on basis of sample information : In the sample of 400 households, 112 were watching the series. At the 5% significance level, would the series be judged successful on basis of this sample information?
Capital concepts as insights into the maintenance : Summarize the author's main thesis. Analyze the arguments he offers in defense of his position. Explain how relevant Brätland's position is for infrastructure projects in your country or region.
Estimate total alkalinity of the water : A water sample has a pH of 8.21 and a total calcium concentration of 143 ppm. What is the total alkalinity of the water?

Reviews

Write a Review

 

Basic Statistics Questions & Answers

  Number of prizes in a randomly chosen multi-pack

If the packets are sold in multi-packs containing six packets, what is the distribution of the number of prizes in a randomly chosen multi-pack?

  Determine expected value of random variable

Harrington Health Food stocks 5 loaves of Neutro-Bread. The probability distribution for sales of Neutro-Bread is listed in following table. How many loaves will Harrington sell on average?

  Does smiling cause mood to rise

Does smiling cause mood to rise (i.e., become more positive)? Sketch between-participants, within-participants, and matched-participants designs that address this question and discuss the advantages and disadvantages of each to yielding data that ..

  Critical f value chosen

What was the critical F value chosen?

  Multiple regression model using revenue dependent variable

Estimate a multiple regression model using revenue as your dependent variable. For independent variables, include population, average income, screens, theatre age, and dummy variables for mall and strip mall.

  Evidence of difference in proportion of dvds purchased

At 0.05 level significance, is there evidence of the difference in proportion of dvds purchased on basis of the kind of media used (Mailing, E-Mail)?

  Statistic-critical value and p value

Suppose a study is constructed to test a claim, at a 0.05 signifigance level that a population proportion is 40%. A simple random sample of 750 subjects has a proportion of 42%.

  Ceo of the organization needs to forcast the proportion

To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.

  Pearson correlation coefficient-regression analysis

Find the difference between the actual Y value and predicted Y value for each individual, square the differences, and add the squared values to obtain SS residual.

  Payoff table for mountain ski decision problem

Construct a payoff table for Mountain Ski's decision problem of how many pairs of skis to order. What is the best decision from an expected value basis?

  Different random samples of six accounts are possible

Suppose that, from a population of 75 bank accounts, we want to take a random sample of six accounts in order to learn about the population. How many different random samples of six accounts are possible?

  Discrete probability and discrete data

A discrete probability is the likelihood that certain discrete data will occur. What is discrete data? Consider a scenario where you could use a discrete probability to predict the likelihood of an event.

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