Questions from Applied Statistics

Q: Concerns about climate change and CO2 reduction have initiated the commercial production

Concerns about climate change and CO2 reduction have initiated the commercial production of blends of biodiesel (e.g., from renewable sources) and petrodiesel (from fossil fuel). Random samples of 35...

Q: Use the following information x bar = 3.7, s

Use the following information x bar = 3.7, s = 0.2, n = 1,200, N = 5,800—to calculate confidence intervals for μ assuming the sample is from a normal population: (a) 90 percent confidence; (b) 95 per...

Q: Police records in the town of Saratoga show that 15 percent of

Police records in the town of Saratoga show that 15 percent of the drivers stopped for speeding have invalid licenses. If 12 drivers are stopped for speeding, find the probability that (a) none will h...

Q: For each level of precision, find the required sample size to

For each level of precision, find the required sample size to estimate the mean starting salary for a new CPA with 95 percent confidence, assuming a population standard deviation of $7,500 (same as la...

Q: The EPA city/hwy mpg range for a Saturn Vue FWD

The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. (a) Estimate σ using Method 3 from Table 8.11. (b) If you owned this vehicle, how large a sam...

Q: What sample size would be required to estimate the true proportion of

What sample size would be required to estimate the true proportion of American female business executives who prefer the title “Ms.,” with an error of ±0.025 and 98 percent confidence?

Q: What sample size would be needed to estimate the true proportion of

What sample size would be needed to estimate the true proportion of students at your college (if you are a student) who are wearing backpacks, with 95 percent confidence and an error of ±0.04?

Q: How large a sample size would be needed to estimate the percentage

How large a sample size would be needed to estimate the percentage of wireless routers in San Francisco that use data encryption, with an error of ±2 percent and 95 percent confidence?

Q: The mean potassium content of a popular sports drink is listed as

The mean potassium content of a popular sports drink is listed as 140 mg in a 32-oz bottle. Analysis of 20 bottles indicates a sample mean of 139.4 mg. (a) Write the hypotheses for a two-tailed test o...

Q: Calculate the test statistic and p-value for each sample.

Calculate the test statistic and p-value for each sample. a. H0: μ = 60 versus H1: μ ≠ 60, α = .025, / = 63, σ = 8, n = 16 b. H0: μ > 60 versus H1: μ < 60, α = .05, / = 58, σ = 5, n = 25 c. H0: μ < 6...