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1. A producer specifies that the mean lifetime of a certain type of battery is at least 240 hours. A sample of 18 such batteries yielded the following data.
237 242 232
242 248 230
244 243 254
262 234 220
225 236 232
218 228 240
Assuming that the life of the batteries is approximately normally distributed, do the data indicate that the specifications are not being met?
2. A company supplies plastic sheets for industrial use. A new type of plastic has been produced and the company would like to claim that the average stress resistance of this new product is at least 30.0, where stress resistance is measured in pounds per square inch (psi) necessary to crack the sheet. The following random sample was drawn off the production line. Based on this sample, would the claim clearly be unjustified?
30.1 32.7 22.5 27.527.7 29.8 28.9 31.431.2 24.3 26.4 22.829.1 33.4 32.5 21.7
Assume normality and use the 5 percent level of significance.
Refer to Exercises 9.21 and 9.29 (p. 487,493). The SAS simple linear regression printout relating number of employees y to age of a fast-growing firm x is reproduced above.
a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent. (hint: proportion is number of successes divide
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
Describe a study design that would require a matched-pairs t procedure to analyze the results.- Describe a study design that would require a twosample't procedure to analyze t
In a sample of 476 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the Pvalue for a test of the
A matched pairs experiment compares the taste of instant versus fresh-brewed coffee. Each subject tastes two unmarked cups of coffee, one of each type, in random order and
Do cars get better gas mileage with premium instead of regular unleaded gasoline? While it might be possible to test some engines in a laboratory setting, we'd rather use re
Explain why an observed value of 250 hours is not unusual for an individual light bulb, even though it is outside the confidence interval you calculated.
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