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"In each of the following situations, a hypothesis test for a population mean is needed. For each situation select the correct choice of the null hypothesis H0 and the alternative hypothesis Ha.
Situation 1. Experiments on learning in animals sometimes measure how long it takes a mouse to find its way through a maze. The mean time is 18 seconds for one particular maze. A researcher thinks that a loud noise will cause the mice to complete the maze faster. She measures how long each of 10 mice takes with a noise as stimulus.
Choose the correct null hypothesis H0 and alternative hypothesis Ha from the choices below.
a) H0: μ = 18; Ha: μ < 18.b) H0: μ = 18; Ha: μ > 18.c) H0: y = 18; Ha: y < 18.d) H0: y = 18; Ha: y > 18.e) H0: μ = y; Ha: μ < y.f) H0: y = 18; Ha: y ≠ 18.g) H0: μ = 18; Ha: μ ≠ 18.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
A random sample of 64 light bulbs indicates a sample mean life of 350 hours. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
Researcher expects 12 point treatment effect and plans to use two-tailed hypothesis test with u α = .05. Calculate the power of test if researcher uses a sample of n = 16 individuals.
If die is loaded so that 6 comes up with probability 0.2 and probabilities of 2,3,4, and 5 faces are not affected, determine the assignment of probabilities to the six faces?
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
From a random sample of 48 days in a recent year, U.S. gasoline prices had a mean of $2.34 (wow - that's old data!) and a standard deviation of $0.32. Construct the 90% and 95% confidence intervals for the population mean.
In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. Is this relationship positive, negative or no relation?
Ten pairs of points yielded a correlation coefficient y of 0.79. If a=0.05, which of the following statements is correct if H 0:P=0? (Do not calculate a t-value.)
Test the hypothesis that the proportion of all student cell phone users in the United States who own a smartphone is 35%. Use the 5% level of significance and report your results.
Last week I used a stopwatch to measure the echo time of my snare drum in the hall outside my classroom, which is 80 meters long. The average echo time was 10 milliseconds.
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