Crawford Industries purchases

Crawford Industries purchases step-down electrical convertersfrom two suppliers. The converters from the two suppliers appear tohave the same average life (measured in hours) but the variabilityin useful life appears be different for the two suppliers. Inrandom samples of 9 converters from supplier A and 9 convertersfrom supplier B, the variance in the sample A was 600; the variancein the sample B was 2800. Assume that the life of the converters isnormally distributed in each population. Test the hypothesis thatthe variances of the two populations are equal, using asignificance level of 2%. Report the F statistic(Fstat) for the test.

a) 3.160

b) 6.178

c) 4.667

d) 2.965

Answer:

F statistic (Fstat) for the test is4.667 (Option C iscorrect. Calculation is shown below)

Following are steps for performing F-test for theEquality of Two Population Variances:

Let s12 = Variance of Sample B,s22 = Variance of Sample A

Ho: σ12​ = σ22

Ha: σ12 ≠ σ22

Here, σ12 = Population Variance of SampleB, σ22 = Population Variance of Sample A

Thus, there is notenough evidence to claim that the variability in useful life isdifferent for the two suppliers.


 
"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"

Calculate your order
Pages (275 words)
Standard price: $0.00
Client Reviews
4.9
Sitejabber
4.6
Trustpilot
4.8
Our Guarantees
100% Confidentiality
Information about customers is confidential and never disclosed to third parties.
Original Writing
We complete all papers from scratch. You can get a plagiarism report.
Timely Delivery
No missed deadlines – 97% of assignments are completed in time.
Money Back
If you're confident that a writer didn't follow your order details, ask for a refund.

Calculate the price of your order

You will get a personal manager and a discount.
We'll send you the first draft for approval by at
Total price:
$0.00
Power up Your Academic Success with the
Team of Professionals. We’ve Got Your Back.
Power up Your Study Success with Experts We’ve Got Your Back.