Question

Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples of...

Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples of a particular type of metal alloy. The results are shown in the following table. Assume that hardness is normally distributed. (1) Assuming that the variances ?ଵ ଶ and ?ଶ ଶ are equal, construct a 95% confidence interval on the difference in mean hardness. (2) Construct a 90% confidence interval on the ratio ?ଵ ଶ ?ଶ ൘ ଶ. Does the assumption made earlier of equal variances seem reasonable?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Assuming Data is

a)

b)

CI = (0.3054,3.0864)

yes, because 1 is present in confidence interval

Please give me a thumbs-up if this helps you out. Thank you! :)

0 0
Know the answer?
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
Similar Questions
Two different hardening processes (1) saltwater quenching and (2) oil quenching , are used on sample...
Two different hardening processes (1) saltwater quenching and (2) oil quenching , are used on sample of particular metal alloy. the hardness test results of samples are shown on the table. Salt water quench 145,150,153,148,141,152,146,154,139,148 Oil quench 152, 150, 147,155,140,146,158,152,151,143 Calculate mean values and standard deviation of two processes Construct a 95% confidence between two mean values Chech whether std dev(a) a1^2=a2^2 Test the hypothesis that the mean hardeness for saltwater quenching equals oil quenching process. Mar the regions in...
Consider the following data from two independent samples with equal population variances. Construct a 90% confidence...
Consider the following data from two independent samples with equal population variances. Construct a 90% confidence interval to estimate the difference in population means. Assume the population variances are equal and that the populations are normally distributed. x1 = 37.1 x2 = 32.2 s1 = 8.9 s2 = 9.1 n1 = 15 n2 = 16
Given two independent random samples with the following results: n1=11 x‾1=131 s1=30 n2=13 x‾2=162 s2=33 Use...
Given two independent random samples with the following results: n1=11 x‾1=131 s1=30 n2=13 x‾2=162 s2=33 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. Step 1 of 3: Find the point estimate that should be used in constructing the confidence interval. Step 2 of 3: Find the margin of error to be used in constructing the...
Given two independent random samples with the following results: n1=7 x‾1=129 s1=14 n2=14     x‾2=159 s2=24 Use...
Given two independent random samples with the following results: n1=7 x‾1=129 s1=14 n2=14     x‾2=159 s2=24 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. Step 1 of 3: Find the point estimate that should be used in constructing the confidence interval. Step 2 of 3: Find the margin of error to be used in constructing the...
Given two independent random samples with the following results: n1=11 x‾1=128 s1=23   n2=13 x‾2=110 s2=32 Use...
Given two independent random samples with the following results: n1=11 x‾1=128 s1=23   n2=13 x‾2=110 s2=32 Use this data to find the 95%95% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 1 of 3: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places. Step 2 of 3: Find the standard...
6. Given two independent random samples with the following results: ?ଵ = 7 ?̅ଵ = 103...
6. Given two independent random samples with the following results: ?ଵ = 7 ?̅ଵ = 103 ?ଵ = 34 Use this data to find the 90% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. ?ଶ = 12 ?̅ଶ = 82 ?ଶ = 15 Step 1. Find the point estimate that should be used in constructing the confidence interval. Answer: ____________________ Step 2....
Given two independent random samples with the following results: n1=11x‾1=80s1=28   n2=9x‾2=99s2=18 Use this data to find...
Given two independent random samples with the following results: n1=11x‾1=80s1=28   n2=9x‾2=99s2=18 Use this data to find the 90% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Step 1 of 3 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places
Given two independent random samples with the following results: n1=9    n2=13 x‾1=153 x‾2=113 s1=30   ...
Given two independent random samples with the following results: n1=9    n2=13 x‾1=153 x‾2=113 s1=30    s2=26 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed. Copy Data Step 2 of 3 : Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.
Exercise 2. The following information is based on independent random samples taken from two normally distributed...
Exercise 2. The following information is based on independent random samples taken from two normally distributed populations having equal variances: Sample 1 Sample 2 n1= 15 n2= 13 x1= 50 x2= 53 s1= 5 s2= 6 Based on the sample information, determine the 90% confidence interval estimate for the difference between the two population means.
Given two independent random samples with the following results: n1 = 11            n2 = 13...
Given two independent random samples with the following results: n1 = 11            n2 = 13 xbar1 = 162 xbar^2 = 130 s1 = 31 s2 = 30 Use this data to find the 95% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Copy Data Step 1 of 3: Find the critical value that should be used in constructing the confidence interval. Round...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT