Answer Happy

LE CHOICE. Choose the one alternative that best completes the statement or answers the question. 11 A local tennis pro-shop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the pro-shop consistently strings rackets at lower tensions, on average, than requested. To support this claim, the customer asked the pro shop to string 15 new rackets at 53 psi. Upon receiving the rackets, the customer measured the tension of each and calculated the following summary statistics: x = 51 psi, s=2.2 psi. In order to conduct the test, the customer selected a significance level of a = .01. Interpret this value. - A) The smallest value of a that you can use and still reject Ho is 0.01. B) The probability of concluding that the true mean is less than 53 psi when in fact it is equal to 53 psi is only .01. C) The probability of making a Type II error is 0.99. D) There is a 1% chance that the sample will be biased.
ULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. nd the indicated z-score. 3 3) Determine the two z-scores that separate the middle 95% of the distribution from the area in the tails of the standard normal distribution. A) 0 and 2.05 B)-2.33 and 2.33 C) -1.75 and 1.75 D) -1.96 and 1.96 ide an appropriate response. 4) Suppose a population has a nean of 7 for some characteristic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What is the standard error of the mean? A) 3.3 B) 0.7 C) 0.15 D) 1.2 5) The number of violent crimes committed in a day possesses a distribution with a mean of 2.8 crimes per day and a standard deviation of 6 crimes per day. A random sample of 100 days was observed, and the mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample mean. A) approximately normal with mean = 2.8 and standard deviation = 0.6 B) approximately normal with mean = 2.8 and standard deviation = 6 C) shape unknown with mean D) shape unknown with mean = : 2.8 and standard deviation = 0.6 : 2.8 and standard deviation = 6