# Cigarette tar 1 21 μ o h the mean amount of tar in

• Homework Help
• 47
• 67% (6) 4 out of 6 people found this document helpful

This preview shows page 42 - 46 out of 47 pages.

##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
The document you are viewing contains questions related to this textbook.
Chapter A-A / Exercise 6
What is Psychology?: Foundations, Applications, and Integration
Pastorino
Expert Verified
Cigarette Tar 1 . 21 : μ o H The mean amount of tar in 100mm filtered cigarettes is 21.1 mg. 1 . 21 : < μ a H The mean amount of tar in 100mm filtered cigarettes is < 21.1 mg. CLAIM Given: _ x = 13.2 mg μ = 21.1 mg s = 3.7 mg n = 25 α = .05 Left-tailed test n s x t μ 0 = = -10.67 (Test Stat.) Critical Value = -1.711 Conclusion: Reject null. At the α = .05 significance level the data provide sufficient evidence to reject the null hypothesis that the mean amount of tar in 100 mm filtered cigarettes is 21.1 mg. Retain T.S: -10.67 CV = -1.711 Reject
##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
The document you are viewing contains questions related to this textbook.
Chapter A-A / Exercise 6
What is Psychology?: Foundations, Applications, and Integration
Pastorino
Expert Verified
ANSWER KEY Problem 24.2: Toxic Mushrooms: Cadmium, a heavy metal, is toxic to animals. Mushrooms, however, are able to absorb it and accumulate cadmium at high concentrations. The Czech and Slovak governments have set a safety level for cadmium in dry vegetables at 0.5 parts per million (ppm). A sample of 12 Boletus piniletus pinicola mushrooms has a mean cadmium level of .53 ppm and a standard deviation of 0.37 ppm. At the α = .05 significance level, do the data provide sufficient evidence to conclude that the mean cadmium level in Boletus piniletus pinicola mushrooms is greater than the government’s recommended limit of .5 ppm? Toxic Mushrooms 5 . : μ o H The safe level of cadmium in Boletus mushrooms is .5ppm CLAIM 5 . : > μ a H The level of cadmium in Boletus mushrooms exceeds .5 ppm Given: _ x = .526 ppm μ = .5 ppm σ = .37 ppm n = 12 α = .05 Right-tailed test n x z σ μ 0 = = .2808 (Test Stat.) Critical Value = 1.645 Conclusion: Fail to reject. At the α = .05 significance level the data do not provide sufficient evidence to conclude that the mean cadmium level in Boletus pinicola mushrooms is greater than the government recommended limit of .5 ppm. Problem 24.3 Acid Rain and Lake Acidity: Acid rain from the burning of fossil fuels has caused many lakes around the world to become acidic. A lake is classified as non-acidic if it has a pH greater than 6. Scientists obtained water samples from 15 high mountain lakes in the Southern Alps. The mean pH of these lakes was 6.6 with a standard deviation was 0.672. At the α = .05 significance level, do the data provide sufficient evidence that, on average, high mountain lakes in the Southern Alps are non- acidic (i.e., greater than a pH of 6)? Retain T.S: .2808 C.V.1.645 Reject
43