Statistics

A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 24 helmets contained such defects.

a. Does this finding support the researcher’s claim? Used a fixed-level test with α = 0.01
b. Find the P-value for this test.

  1. 👍 0
  2. 👎 0
  3. 👁 176
asked by Josh
  1. You can use a one-sample proportional z-test for your data. (Test sample proportion = 24/200 and sample size = 200) Convert all fractions to decimals. Find the critical value in the appropriate table at .01 level of significance for a two-tailed test. Compare the test statistic you calculate to the critical value from the table. If the test statistic exceeds the critical value, reject the null. If the test statistic does not exceed the critical value, do not reject the null. You can draw your conclusions from there.
    Note: The p-value is the actual level of the test statistic you calculate. Find using the appropriate table.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEMISTRY

    PLEASE HELP I REALLY DO NOT UNDERSTAND THIS YOU DON'T REALLY HAVE TO ANSWER THE QUESTIONS BUT AT LEAST JSUT A LITTLE HINT THATS ALL PLEASE AND I HAVE A QUIZ ON THIS TOMORROW MY TEACHER REALLY CANNOT TEACH 1) what flaws exsit in

    asked by Anonymous on November 14, 2007
  2. chemistry

    1) what flaws exsit in Dalton's model of the atom? 2) what flaws exist in Thompson's plum pudding model of the atom? 3) what flaws exist in Rutherford's model of the atom? 4) what flaws in Bohr's model of the atom? 5) do any flaws

    asked by Anonymous on November 14, 2007
  3. English

    Are Romeo and Juliet destroyed by fate, by their own flaws, by the flaws of others, or by a combination of factors?

    asked by sami doodles :-) on March 20, 2013
  4. Stat

    The army reports that the distribution of head circumfererence among soldiers is approximately Normal with mean 22.8 inches and standard deviation 1.1 inches. Helmets are mass produced for all except the smallest 5 % and the

    asked by Stat (Alegra One Help I think) on September 21, 2009
  5. Physics.

    A punter kicks a football at an angle of 45 degrees to the ground. The football has an initial velocity of 25 m/s, make a diagram and calculate: a) How long was the football in the air? b) How far does the football travel

    asked by Noemi on January 13, 2013
  6. novel let the circle be unbroken

    describe cassie logan based on events of chapter 1...her traits and flaws.. what flaws can you immediately detect..how does she feel about family and friends..cite examples from text

    asked by mae on November 5, 2012
  7. statistics

    A researcher wants to study the spending habits of customers of a local shopping mall. The mall manager claims that the average spending per customer is $70, but the researcher believes that the average is less than $70. A simple

    asked by James on October 13, 2012
  8. physics

    Question Part Points Submissions Used A quarterback claims that he can throw the football a horizontal distance of 196.6 m (215 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of

    asked by Cody on February 3, 2012
  9. Binomial and Poisson distribution

    A machine produces ribbon in which flaws occur randomly at an average rate of one flaw in 100m. Find the probability that there are 3 or more flaws in a randomly chosen 200m of ribbon. Find the length of ribbon such that the

    asked by Kelvin on June 1, 2013
  10. Math...again

    A quality control inspector found flaws in 13 out of 150 sweaters. Find the probabillity that a sweater has a flaw. Round to nearest tenth of a % But what if the company produces 500 sweaters, how many will NOT have flaws

    asked by Marco on May 14, 2008

More Similar Questions