Questions from Applied Statistics

Q: In preliminary tests of a vaccine that may help smokers quit by

In preliminary tests of a vaccine that may help smokers quit by reducing the “rush” from tobacco, 64 subjects who wanted to quit smoking were given either a placebo or the vaccine. Of the 32 in the pl...

Q: Blue Box is testing a new “half price on Tuesday”

Blue Box is testing a new “half price on Tuesday” policy on DVD rentals at a sample of 10 locations. (a). At α = .10, do the data show that the mea...

Q: The U.S. government’s “Cash for Clunkers” program

The U.S. government’s “Cash for Clunkers” program encouraged individuals to trade in their old gas-guzzlers for new, more efficient vehicles. At &...

Q: The coach told the high school swim team that times in the

The coach told the high school swim team that times in the 200-yard individual medley in the Division I-AA Swim Championships typically are more than 1/2 second faster than their seed times going into...

Q: Below is a random sample of shoe sizes for 12 mothers and

Below is a random sample of shoe sizes for 12 mothers and their daughters. (a) At α = .01, does this sample show that women’s shoe sizes have increased? State your h...

Q: A newly installed automatic gate system was being tested to see if

A newly installed automatic gate system was being tested to see if the number of failures in 1,000 entry attempts was the same as the number of failures in 1,000 exit attempts. A random sample of eigh...

Q: Repeat the previous exercise, assuming unequal variances. Calculate the p

Repeat the previous exercise, assuming unequal variances. Calculate the p-value using Excel, and show the Excel formula you used. Previous exercise: Do a two-sample test for equality of means assumi...

Q: Calculate the test statistic and p-value for a test of

Calculate the test statistic and p-value for a test of equal population proportions. What is your conclusion? a. Right-tailed test, α = .10, x1 = 228, n1 = 240, x2 = 703, n2 = 760 b. Left-tailed test...

Q: Calculate the test statistic and p-value for a test of

Calculate the test statistic and p-value for a test of equal population proportions. What is your conclusion? a. Left-tailed test, α = .10, x1 = 28, n1 = 336, x2 = 14, n2 = 112 b. Right-tailed test,...

Q: Find the sample proportions and test statistic for equal proportions. Find

Find the sample proportions and test statistic for equal proportions. Find the p-value. a. Dissatisfied workers in two companies: x1 = 40, n1 = 100, x2 = 30, n2 = 100, α = .05, two tailed test. b. Ro...