I need help with 1 and 2 please Files ENME 392 × \\C. ENME 3929/25/201 7 DENME39

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I need help with 1 and 2 please

Files ENME 392 × C. ENME 3929/25/201 7 DENME392 Fal 2017 Witt- × O) ENME 392-9/2012017 ×/ x, M Inbox (A255)-hermann x 17%ZUWritten%20HW5.pdf ::: AppsFaculty Directory | M D Nrw Tab Cassinpria Ru1dGuil Illegible scans will NOT he graded and he returned with a NO SECOND CHANCES. Problems (15 pts each) 1. A poll of 24 mechanical engineers was taken on how many years they believe they need after college lo truly feel that they have “leaned"about their field. The dat, as shown below was used to make inferences regarding the rate of professional development of engineers. Compute a 95 percent contidcncc interval about the true mean number of s that it takes 10 20 8.5 30 16 18 17 2. A joining adhesive is being tested for an engincering part. proportion of parts with inadequate adhesion is sought. 200 parts are tested and the To ensure 98% confidence in the estimated interval of ±0.05 around the true population parameter, what must be the size of the sample? The adhesive in 30 tested parts was found to be inadequate. Find the 98% confidence interval using this set. Based on the answer from part b. calculate the actual sample size needed so that 98% confidence interval will be within ±0.05. a. b. c. 3. The tensile strength of a steel specimen was measured 50 times and the sample mean was found to be 240 MPa with a standard deviation of 4 MPa. a) Find a 95% confidence interval for the mean tensile strength. b) The operator measuring the tensile strengths reported a confidence interval of (239.09, 240.90) but neglected to specify the level. Find the P-value corresponding to the given interval. 4· In a survey of the amount of sleep ENME students get- 12 students volunteered their information. The hours of sleep were indicated as follows: 5.0, 6.2, 6.0, 4.8, 6.0, 5.8, 5.5, 6.2, 6.0, 6.5, 6.3, and 5.8. We assume that these 12 students constitute a simple random sample of a population of ME undergraduate engineering students. a. b. c. Estimate a mean with a 95% confidence interval. Estimate a 95% confidence interval for the population variance. How does the interval for the mean change if you could get 48 students to respond to the survey, yet the mean and variance from the larger sample are identical to part a. : 10/11/2011 1139 AM Type here to search 6)

Explanation / Answer

1.

Using Minitab:

One-Sample T: Data.

Variable N Mean StDev SE Mean 95% CI
Data. 24 12.58 6.60 1.35 (9.80, 15.37)

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