Practice 7. The drying time of a certain type of paint under specified test conditions isknown to be normally distributed with mean value 30 min and standard deviation 3 min.Chemists have proposed a new additive designed to decrease average drying time. Because ofthe expense associated with the additive, evidence should strongly suggest an improvementin average drying time before such a conclusion is adopted. Experimental data consists ofdrying times from n = 49 test specimens.=(a) From the sample, it is given that ₁x 1440.6. Using the significance level a = 0.01,test the following hypothesis against its alternative.:Ho : | = 30, USHa : μ < 30.(b) State the type I and II errors in the context of the problem.(c) Find the type II error rate of the test in (a) when μla = 29.

For the distribution of drying time (in minutes) of paint, the population standard deviation is…

Answered: Practice 7. The drying time of a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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To determine if their 2.50 inch galvanized pipes are properly adjusted, Hoffman Manufacturing has decided to use an X-Chart which uses the range to estimate the variability in the sample. Table Answer Control Chart Step 4 of 7: Use the following sample data, taken from the next time period, to determine if the process is "In Control" or "Out of Control". Observations: 2.55, 2.49, 2.57, 2.55, 2.58 Sample Mean: 2.548 Period obs1 obs2 obs3 obs4 obs5 1 2 3 4 5 6 7 The average of the selected cell(s) is2.520. Copy Value Sample Mean Sample Range 2.4960 2.54 2.54 2.5040 2.45 2.45 2.4760 2.47 2.50 2.5180 2.51 2.46 2.5040 2.52 2.51 2.48 2.49 2.48 2.48 2.48 2.48 2.53 2.49 2.46 2.55 2.54 2.53 2.49 2.53 2.53 2.50 2.48 2.52 2.55 2.50 2.5100 2.46 2.54 2.54 2.50 2.51 2.5100 2.46 2.53 2.50 2.50 2.45 2.51 2.50 2.53 2.46 2.51 2.48 2.53 2.48 2.47 2.53 2.50 2.53 2.51 2.46 8 2.4880 9 2.47 2.51 2.5040 10 2.46 2.4880 11 2.54 2.46 2.4960 12 2.47 2.4940 13 2.53 2.49 2.51 2.5060 2.50 2.50 14 2.47 2.51 2.51 2.53…
Question 16. Please Show Work
Iq and lead exposure. A sample of subjects with low lead levels in their blood was taken and another random sample was taken with high levels of lead in their blood. Use a 0.05 significant level to test claim that iq score of people p le w low lead levels is higher than the mean iq score of people w higher lead levels. Use p value approach LLL N =78 SAMPLE MEAN=92.88 S=15.34 HLL N=21 SM= 86.90 S=8.99
Rachael got a 660 on the analytical portion of the Graduate Record Exam (GRE). If GRE scores are normally distributed and have mean μ = 600 and standard deviation σ = 30, what is her standardized score?
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
It has been estimated that the 1991 G-car obtains a mean of 35 miles per gallon on the highway, and the company that manufactures the car claims that it exceeds the estimate in highway driving. To support its assertion, the company randomly selects 49 1991 G-cars and records the mileage obtained for each car over a driving course similar to that used to obtain the estimate. The following data resulted: x = 36.5 miles per gallon, s = 7 miles per gallon. %3D a. Find the observed significance level for testing Ho: u= 35 vs. Ha: u> 35. %3D b. For what value of significance level a, you will reject the null hypothesis.
I attached.
To determine if their 1.33 centimeter galvanized pipes are properly adjusted, Fogarty Manufacturing has decided to use an X-Chart which uses the range to estimate the variability in the sample. Answer Table Step 4 of 7: Use the following sample data, taken from the next time period, to determine if the process is "In Control" or "Out of Control". Observations: 1.4, 1.42, 1.38, 1.37, 1.4 Sample Mean: 1.394 Period 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Control Chart Copy Table Average Values The average of the selected cell(s) is 1.340. Copy Value obs1 obs2 obs3 obs4 obs5 Sample Mean Sample Range 1.34 1.29 1.35 1.33 1.35 1.3320 1.35 1.35 1.29 1.38 1.28 1.3300 1.34 1.35 1.32 1.33 1.34 1.3360 1.36 1.29 1.37 1.35 1.30 1.3340 1.29 1.31 1.33 1.32 1.38 1.3260 1.31 1.32 1.31 1.31 1.3180 1.34 1.33 1.3300 1.38 1.31 1.29 1.34 1.35 1.33 1.30 1.35 1.32 1.3300 1.34 1.37. 1.28 1.36 1.3440 1.37 1.30 1.3080 1.37 1.29 1.30 1.28 1.35 1.36 1.32 1.31 1.32 1.29 1.36 1.38 1.3400 1.3280 1.30 1.35 1.32 1.32 1.29…

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