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A researcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression. One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. A second sample of rats receives a drug that lowers brain levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats display. The data are as follows.
Control
Low Serotonin
n = 10
n = 15
xbar = 14
xbar = 19
SS = 180.5
SS = 130
a) Does the drug have a significant effect on aggression? Use Alpha = .05.
b) What is Cohen's d?
A magazine article stated that the average age of women who are getting married for the first time is 26 years. A researcher decided to test this hypothesis at α = .02. She selected a sample of 25 women who were recently married for the first time..
We are doing a team project for our statistics class and our project is about "Math Anxiety". We are stuck on one question and the questions is "the teams will state the null and alternative hypotheses
A packaging company distributes quarter-pound beef patties to local fast-food restaurants. The restaurants demand the weights to be 4 plus or minus .02 ounces.
You took a sample of your expenses for 20 weeks and found that the average is $285 and the standard deviation for the sample is $25. Set up your null and alternative hypothesis for testing whether your cists are different and do the analysis using..
suppose the amount of time it takes a popcorn kernel to pop is normally distributed with a mean of 150 seconds and a
Determine the shape of chi-square distribution?
Avid poker player sees 100 hands a week, 52 weeks a year, for 20 years. What is the probability that she sees a royal straight flush dealt at least once?
hypothesis testing of single mean.a recent article in the wall street journal reported that the 30-year mortgage rate
A doctor suspected that smokers between 40 and 50 with lung disease had been smoking on average more than 20 years - significance level is there sufficient evidence to justify the doctors belief?
He surveys several businesses and finds the standard deviation in monthly advertising costs is $23 for 12 hair salons, and $43 for 8 nail salons.
The batteries used in a digital watch have an operating life that is normally distributed. As sample of 18 batteries reveals a mean of 2.35 years and a standard deviation of 0.4 years.
Determine what would happen to your critical value (Z) if you were to change the level of significance (a) from .05 to .1 in a two tailed hypothesis test.
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