First we need to find the variance of sample. Following table shows the calculations::
X | (X-mean)^2 | |
17 | 78.44822041 | |
17 | 78.44822041 | |
24 | 3.44882041 | |
24 | 3.44882041 | |
25 | 0.73462041 | |
34 | 66.30682041 | |
40 | 200.0216204 | |
Total | 181 | 430.8571429 |
-------------------------------------------------------
9. The lifetime of a certain brand of light bulbs are assumed to be normally distributed....
9. The lifetime of a certain brand of lightbulbs are assumed to be normally distributed. A researcher took a random sample of these lightbulbs and observed the following failure times: 17 | 17 | 24 24 | 25 34 40 Let xay be the critical value of a t random variable with v degrees of freedom. The following table lists values of x2., for specific combinations of a and v: v=6 v=7) a= 0.975 1.237 1.690 a = 0.95 1.635...
9. The lifetime of a certain brand of lightbulbs are assumed to be normally distributed. A researcher took a random sample of these lightbulbs and observed the following failure times 24 25 17 24 34 40 17 Let xbe the critical value of a t random variable with v degrees of freedom. The following table lists values of x for specific combinations of a and v a 0.05 Q=0.975 a=0.025 O= 0.95 1.237 14.449 v6 1.635 12.592 16.013 1.690 1.2.167...
The lifetime of a certain brand of industrial light bulb, Y, is assumed to follow gamma(a = 3,8 = 6). A random sample Yı,...,Yn of n = 25 light bulbs will be taken. Approximate the probability that the sample mean Y will be larger than 21.
2. Suppose the lifetime of a particular brand of light bulbs is normally distributed. A random sample of 27 light bulbs yields an average lifetime of 410 hours and a sample standard deviation of 67 hours. n ave irs a) Find the p-value of the test Ho: u = 432 hours vs. H1: U #432 hours. b) Test Ho:0 = 56 hours vs. H1:0 > 56 hours at a 5% level of significance. Find the power of the test in...
2. Suppose the lifetime of a particular brand of light bulbs is normally distributed. A random sample of 27 light bulbs yields an average lifetime of 410 hours and a sample standard deviation of 67 hours. a) Find the p-value of the test Ho: u = 432 hours vs. H1 : ! #432 hours. b) Test Ho:0= 56 hours vs. H1:0> 56 hours rs rs at a 5% level of significance. c) Find the power of the test in part...
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 47 hours. Suppose that a random sample of 150 bulbs of this brand has a mean lifetime of 478 hours. Find a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the...
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 49 hours. Suppose that a random sample of 90 bulbs of this brand has a mean lifetime of 500 hours. Find a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the...
0.270 is WRONG, Please provide correct answer. Conduct the hypothesis test and provide the test statistic and the critical value, and state the conclusion. A person randomly selected 100 checks and recorded the cents portions of those checks. The table below lists those cents portions categorized according to the ated values Use a 0.10 significance level to test the claim that the four categories are equally likely. The person expected that many checks for whole dollar amounts would result in...
l. (why?) Finally, r apur By the number of moles of vapor to obtain the molecular mass. molecular massmoles of vapor Determine the average molecular mass of the unknown from your three trials. (You may use the best two trials if one is very different from the others.) Questions: 1. If the outside of your flask is not dry when the first mass determination is made and it is dried for the second mass determination, what effect will that have...
7.5.9 Find the critical value(s) and rejection region(s) for a two-tailed chi-square test with a sample size n=17 and level of significance a=0.10 E! Click the icon to view the Chi-Square Distribution Table. Find the critical value(s). (Round to three decimal places as needed. Use a comma to separate answers as needed.) VUGU 0 сера ga x Two tails Right tail Degrees of freedom ar 0.995 0.99 0.975 0.95 0.90 0.10 0.05 1 3 4 5 6 7 8 9...