Solution:- Given that information: standard deviation = s = 0.04 , ?^2 = 0.002 n = 27
Test statistic = X^2 = (n-1)*(s^2/?^2)
= (27-1)*(0.04^2/0.002)
= 20.800
The pressure reduction of a sample of 27 fuel valves in a preliminary test sample for...
A new fuel injection system has been engineered for pickup trucks. The new system and the old system both produce about the same average miles per gallon. However, engineers question which system (old or new) will give better consistency in fuel consumption (miles per gallon) under a variety of driving conditions. A random sample of 41 trucks was fitted with the new fuel injection system and driven under different conditions. For these trucks, the sample variance of gasoline consumption was...
Need step 3 only.
A manufacturer claims that the calling range (in feet) of its 900 MHz cordless telephone is greater than that of its leading competitor. A sample of 15 phones from the manufacturer had a mean range of 1280 feet with a standard deviation of 21 feet. A sample of 10 similar phones from its competitor had a mean range of 1230 feet with a standard deviation of 40 feet. Do the results support the manufacturer's claim? Let...
stuck on this
Exercise 11-14 (LO11-2) The null and alternate hypotheses are: random sample of 27 tems from the first population showed a mean of 110 and a standard deviation of 15. A sample of 19 items for the second population showed a mean of 100 and a standard deviation of 6. Use the 0.025 significant level a. Find the de grees of freedom for unequal variance test. (Round down your answer to the nearest whole number) of freedom 21...
Question 14 Two different formulas of an oxygenated motor fuel are being tested to study their road octane numbers. The variance of road octane number for formula 1 is o 1.5 1L.S, and for formula 2 it is 1 o5 = 12. normality (a) Test the hypotheses Ho: μ-μ2 versus H1:HI < μ2 using α Two random samples of size n 1 = 15 and r2-20 are tested, and the mean octane numbers observed are X1 888 fluid ounces and...
A new fuel injection system has been engineered for pickup trucks. The new system and the old system both produce about the same average miles per gallon. However, engineers question which system (old or new) will give better consistency in fuel consumption (miles per gallon) under a variety of driving conditions. A random sample of 31 trucks were fitted with the new fuel injection system and driven under different conditions. For these trucks, the sample variance of gasoline consumption was...
answer all
21 From a population of cans of coffee marked "12 ounces." a sample of 25 cans is selected and the contents of each can are weighed. The sample revealed a mean of 118 ounces with a standard deviation of 0.5 ounces. Test to see if the mean of the population is at least 12 ounces. Assume the population is normally distributed) Use a 05 level of significance. What is the value of test statistic? Not yel www.ed Point...
A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance σ2 = 42.3. In a different section of Chaco Canyon, a random sample of 27 transects gave a sample variance s2 = 50.7 for...
please help me finding the value of the sample test statistic? A) The manufacturer of a sports car claims that the fuel injection system lasts 48 months before it needs to be replaced. A consumer group tests this claim by surveying a random sample of 10 owners who had the fuel injection system replaced. The ages of the cars at the time of replacement were (in months): 25 44 45 48 53 46 30 51 42 52 Use the sample...
Click on the tab BP. The data records the reduction
in Blood Pressure (so a negative value means BP went up!) for
patients at various dosages of a new
drug. Claim. The change in BP for the three
dosages is not the same. Perform the 6 step testing
process doing a one way ANOVA. Get your F
statistic and P value from EXCEL. Follow the example to
get the Excel Output. Include the Excel Output table
(just the table!) in...
A consumer preference study compares the effects of three different bottle designs (A, B, and C) on sales of a popular fabric softener. Fifteen supermarkets of equal sales potential are selected, and 5 of these supermarkets are randomly assigned to each bottle design. The number of bottles sold in 24 hours at each supermarket is recorded. The data obtained are displayed in the table. Let Pa Ho, and c represent mean daily sales using bottle designs A, B, and C,...