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The main reason women seek medical attention for menopausal symptoms is hot flashes. Dietary supplements containing isoflavones derived from natural sources such as soy or red clover are marketed as
A survey of an urban university (population of 25,450) showed that 870 of 1100 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 99% level of
Chemical company claims the one majory product has on average 4.0 fluid oz of caustic materials per gallon.It further states that the distribution of caustic materials per gallon is normal and has
The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What assumptions do you need to make about the shape of the population distribution of all
Run a regression of the dependent variable on the continous and categorical independent variables. What conclusion can you draw about the factors affecting the dependent variable?
The equation for a regression line predicting the number of hours of TV watched by children (Y) from the number of hours of TV watched by their parents (X) is Y' = 4 + 1.2X. The sample size is 12.
the slope of the regression line and test if it differs significantly from zero. the 95% confidence interval for the slope.
In a different regression analysis, 40% of the variance was explained. The sum of squares total is 1000. What is the sum of squares of the predicted values?
A researcher conducted an experiment on the effects of a new "drug "on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received
The data are the times, in minutes, required to teach each sign to each subject. Are there differences amongst chimps and amongst signs? These data meet the assumptions of parametric statistics.
Test scores have a stadard deviation of 18 and a mean of 69. if at random, 49 test scores are picked what is the probability than the mean score is less than 62?
Use the one-proportion z-test to perform an appropriate hypothesis test. Be sure to check the conditions for using that procedure.
Generate 1000 samples of size 350 from a Binomial distribution with probability 2/3. Calculate the mean and standard deviation of the 1000 samples, and compare to the results in (c).
Construct a 90% confidence interval to estimate the average selling price in the population with this sample. What is the margin of error for this interval?
Calculate the sampling error using the first 5 homes in the first row as your sample. Calculate the sampling error using all 10 homes in the first row as your sample.
Fifteen tobacco plants of the same age and genetic strain were randomly assigned to three groups of five plants each. One group was untreated, one was infected with tobacco mosaic virus (TMV), an
Due to constraints of the design, the experiment was run over several days. Are there differences amongst the types of nets? These data meet the assumptions of parametric statistics. Do post hoc tes
A college graduate school president is interested in knowing what proportion of applicants would like to be accepted into the chemistry department. Of a random sample of 75 applicants, 12 requested
A random sample of 45 door-to-door encyclopedia salespersons were asked how long on average they were able to talk to the potential customer. Their answers revealed a mean of 8.5 minutes with a vari
Assume the distribution of the cholesterol for patients in this group is approximately Normal. Find a 95% confidence interval for the average cholesterol of patients at risk fo r heart disease who h
In a learning experiment, untrained mice are placed in a maze and the time required for each mouse to exit the maze is recorded. The average time for untrained mice to exit the maze is ? = 50 second
Assume that a random sample of 500 households in Michigan is taken. Then, the standard error of the sampling distribution of sample proportion of households who have incomes in excess of $60,000 wil
Use the one-proportion z-interval procedure to find the required confidence interval. Be sure to check the conditions for using that procedure.