A stereo manufacturer claims his top-of-the-line turntable has an average lifespan of morethan 15 years. When asked to provide evidence that supports this claim, he obtains from hisfiles the names of 15 customers who have purchased this high quality turntable and askseach how long their turntables ran before needing replacement. From these 15measurements he computes and average lifespan of 17 years with a variance of 4 years.The correct alternative hypothesis is:O A. The average lifespan of turntable is 15 years.B. The average lifespan of turntable is at least 15 years.O C. The average lifespan of turntable is more than 15 years.O D. None of the preceding

Answered: A stereo manufacturer claims his…

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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QUESTION 7 As an owner of a business, having a consistent level of sales is important. Prior to the recession that started in 2007, the standard deviation of the sales of a local business was $581. In a sample of 29 weeks since the start of the recession, sales have averaged $6800 per week with a standard deviation of $754. When testing the hypothesis (at the 5% level of significance) that the variance is higher than it was pre-recession (so the null hypothesis is that the variance is less than 5812 ), what is the critical value? (please round your answer to 2 decimal places)
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
2. Five 2 cm thick experimental pieces of an insulation material were tested atrandom. Resulted compression (y) was measured recorded for the given amount ofmeasured pressure. The data are listed below:Pressure Compression1 12 23 24 35 5Fit a simple linear model relating compression y to the applied pressure x and find:a) error variance.b) the coefficient of correlation.
The weights (in pounds) of 6 vehicles and the variability of their braking distances (in feet) when stopping on a dry surface are shown in the table. Can you conclude that there is a significant linear correlation between vehicle weight and variability in braking distance on a dry surface? Use α=0.01. Weight, x 5920 5370 6500 5100 5890 4800 Variability in 1.76 1.91 1.50 braking distance, y EEE Click here to view a table of critical values for Student's t-distribution. Setup the hypothesis for the test. Ho: P Ha: P 0 0 1.86 1.62 1.67 M
Question A - A company producing steel nails receives an order for 5000 nails of length 50 mm. Due to externalfactors such as temperature and pressure, the lengths of the nails produced by the machine is normallydistributed with a standard deviation of 1.6 mm. Acceptable lengths (lengths that any customer willconsent to buy) must have a tolerance of 2 mm. If the machine is set to produce nails with a meanlength of 5.0 cm, determine the percentage of nails that are acceptable. A. 0.7888 / B. 0.8877 / C. 0.9921 / D. 0.7878 Further to the information provided in question A above, we are informed that nails produced thatare shorter than the minimum acceptable length have to be scrapped. Consider that 4.8cm is still theminimum threshold for acceptable nail length. If the cost to produce one nail is 45 cents, how muchdoes the company incur in Rand losses due to scrapping? A. R247.70 / B. R347.91 / C. R237.60 / D. R471.99 Further considering information given in questions A and question B, if…
Q.4 Calculate the Variance and standard deviation from the following data Daily wages (Rs.) No. of workers 400-450 450-500 500-550 550-600 600-650 650-700 20 30 50 25 20 5
Given the following summary statistics of the data: Ex= 100, Ex=621, n=20, ESS = 9.65 %3D calculate the estimated variance of the error, s and hence the variance of slope coefficient b. e 1 (Round to three decimal places as needed.)
Section 9.2 Question #7 Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. View the data table of IQ scores. Medium Lead Level High Lead Level 72 n2 = 11 96 92 _ x2 = 91.815 85 90 s2 = 10.365 97 83 92 104 111 91 a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population…
Question 2 Light shop wants to inspect purchasing units. 6 bulbs is choosen from 20 units. Of the 20 there were 6 defective units. Use hypergeometric to find the variance of defective units (answer to three decimal places) hp HEWL ETT PACKARD
Suppose that weights of college mathematics textbooks in the United States are normally distributed with mean µ = 2.25 lbs and variance σ2 = 0.2025 lbs. Find the weight that corresponds to Q3 and interpret this measure of position in the context of the problem.
a=1 b=8 c=6 d=0
Step 2 of 3: Compute the Value of the test statistic. Round your answer to three decimal places. Step 3 of 3: Draw a conclusion and interpret the decision

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