HomeworkLib
Question

Given x̅ = 115, µ = 119, σx = 20, and N = 144 conduct a...

Given x̅ = 115, µ = 119, σx = 20, and N = 144 conduct a two-tailed z-test (use sample mean z-score formula). Use α (alpha/criterion) = .05. Be sure to show me the statistical hypotheses (H0 / Ha ) and identify the rejection region (crit), calculate your z-score (obt), and state your conclusion about your z-score. Is it significant or non-significant? Explain why?

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
Given x̅ = 115, µ = 119, σx = 20, and N = 144 conduct a...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at...

    Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 70 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ-Box exceeds 42.    (a) Letting µ represent the mean composite satisfaction rating for the XYZ-Box, set up the null hypothesis H0 and the alternative hypothesis Ha needed if we wish to...

  • The Friendly Fitness Club recorded the weights of its members before they began their fitness program....

    The Friendly Fitness Club recorded the weights of its members before they began their fitness program. They discovered that the weights were normally distributed with a mean of 85kg and a standard deviation of 9.5. After the fitness program was finished, the director of the club randomly selected 49 participants and recorded their weights. She found that the mean weight for this group was 82kg. Use a one-tailed test with an alpha level set at .05 to determine if the...

  • In R, Part 1. Learn to understand the significance level α in hypothesis testing. a) Generate a matrix “ss” with 1000 rows and 10 columns. The elements of “ss” are random samples from standard normal...

    In R, Part 1. Learn to understand the significance level α in hypothesis testing. a) Generate a matrix “ss” with 1000 rows and 10 columns. The elements of “ss” are random samples from standard normal distribution. b) Run the following lines: mytest <- function(x) { return(t.test(x,mu=0)$p.value) } mytest(rnorm(100)) Note that, when you input a vector in the function mytest, you will get the p-value for the one sample t-test H0 : µ = 0 vs Ha : µ =/= 0....

  • An experiment was planned to compare the mean time (in days) required to recover from a...

    An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 mg of vitamin C, μ2, versus those who were not given a vitamin supplement, μ1. Suppose that 34 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows.      No Vitamin Supplement 4 mg Vitamin C Sample size 34 34...

  • A resting systolic blood pressure (BP) of 120 mm Hg is stated to be the population...

    A resting systolic blood pressure (BP) of 120 mm Hg is stated to be the population mean for women. This was based on research conducted by several researchers on women from the healthy general public. Consider 20 first-year resident female doctors drawn at random. The resting systolic BP measured using an electronic sphygmomanometer are listed below. Is the sample significantly different from the population? State the null and alternative hypotheses Set the criteria for a decision: two-tailed test with a...

  • please do all of the steps Zoom 125% Insert Table Chart Text Shape Media Comment For...

    please do all of the steps Zoom 125% Insert Table Chart Text Shape Media Comment For each of the following studies, conduct the 4 steps of hypothesis testing with the z test. If you find it helpful, you can use the boxes on the right to sketch out a normal curve, plot your crew, shade in the region of rejection, and plot your job to help you visualize your decision. Benodo owns an ACT Prep company. He believes that students...

  • Scores in the first and fourth (final) rounds for a sample of 20 golfers who competed...

    Scores in the first and fourth (final) rounds for a sample of 20 golfers who competed in golf tournaments are shown in the following table. Player First Round Final Round Golfer 1 70 72 Golfer 2 71 72 Golfer 3 70 74 Golfer 4 72 71 Golfer 5 70 69 Golfer 6 67 67 Golfer 7 71 68 Golfer 8 68 73 Golfer 9 67 73 Golfer 10 70 69 Player First Round Final Round Golfer 11 72 72 Golfer...

  • Quality of Marriage             Quality of the Parent–Child Relationship 76                   

    Quality of Marriage             Quality of the Parent–Child Relationship 76                                                                    43 81                                                                    33 78                                                                    23 76                                                                    34 76                                                                    31 78                                                                    51 76                                                                    56 78                                                                    43 98                                                                    44 88                                                                    45 76                                                                    32 66                                                                    33 44                                                                    28 67                                                                    39 65                                                                    31 59                                                                    38 87                                                                    21 77                                                                    27 79                                                                    43 85                                                                    46 68                                                                    41 76                                                                    41 77                                                                    48 98                                                                    56 98                                                                    56 99                                                                   55 98                                                                    45 87                                                                   68 67                                                                   54 78                                                                   33 Using the 10 steps for testing hypotheses (list all the ten steps and provide the answer under each), determine if the null hypothesis can be rejected or fail to be rejected.   •1. State the null hypothesis (H0) •2. State the research or alternate...

  • These weekly exercises provide the opportunity for you to understand and apply statistical methods and analysis....

    These weekly exercises provide the opportunity for you to understand and apply statistical methods and analysis. Unless otherwise stated, use 5% (.05) as your alpha level (cutoff for statistical significance). #1. Define "power" in relation to hypothesis testing. #2. Alpha (a) is used to measure the error for decisions concerning true null hypotheses. What is beta (ß) error used to measure? #3. In the following studies, state whether you would use a one-sample t test or a two-independent-sample t test....

  • In recent years more people have been working past the age of 65. In 2005, 27%...

    In recent years more people have been working past the age of 65. In 2005, 27% of people aged 65–69 worked. A recent report from the Organization for Economic Co-operation and Development (OECD) claimed that the percentage working had increased (USA Today, November 16, 2012). The findings reported by the OECD were consistent with taking a sample of 600 people aged 65-69 and finding that 180 of them were working. a. Develop a point estimate of the proportion of people...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT