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A random sample of 6 music majors playing song S counted the number of mistakes each made. Then these musicians played song G and the mistakes were tallied. In between playing the two songs, the stu
Given a standardized normal distribution (with a mean of 0 and a standard devication of 1,) determine the following probabilities.
Write a multiple regression equation relating x1 and the categorical variable to y. Interpret the parameters in your regression equation.
What is the research hypothesis? (null and alternative) Based on the following data, what is the instructor's conclusion? (Please Write 2 sentences explaining your results.
Construct a 95% confidence interval for the proportion of U.S. population who believe at least "somewhat" in doomsday prophecies. (Show your work or formula.). Interpret the interval.
A sample of 25 patients in a doctor's office showed that they had to wait an average of 35 minutes with a standard deviation of 10 minutes before they could see the doctor. Provide a 95% confidence
The average gasoline price of one of the major oil companies has been $3.00 per gallon. Because of shortages in production of crude oil, it is believed that there has been a significant increase in
A student believes that no more than 20% of the students who finish a statistics course get an A. A random sample of 100 students was taken. Twenty-four percent of the students in the sample receive
The average age of the students in the sample was 23 with a standard deviation of 3.5. Determine whether or not the average age of the evening students is significantly different from 21 at the 1%
If the population standard deviation is 12.3 bushels per acre, create a 90% confidence interval for the mean yield in the state this season. What is the margin of error? Create a 99% confidence inte
The U.S. Dept of Treasury claims that it mints quarters to yield a mean weight of 5.670 g. Is this claim consistent with the convidence interval you just calculated? Explain your conclusion and acco
A sociologist wants to determine the current percentage of households using e-mail. How many households surveyed in order to be a 92% confident that the sample percentage is in error by no more than
You work for a consumer watchdog publication and are testing the advertising claims of a light bulb manufacturer. The manufacturer claims that the life span of the bulb is normally distributed, with
Calculate point estimates of the population variance and the population standard deviation. Calculate the standard error of the point estimate found in part (a). Provide an interpretation of the stand
Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not.
He measures the temperature at 36 various random locations, puts the data into a calculator and determines a mean of 65.3 and a standard deviation of 2.4 degrees. Construct a 95% confidence interval
A sample of 800 voters revealed that 52% of them would vote for a specific issue. Create and interpret a 95% confidence interval for the support of the issue. In the interpretation indicate what typ
What size sample will be needed to construct a 95% confidence interval on a ballot issue if the estimate must be ± 2% of the actual percent. This issue looks very close in the election.
Is there a statistically significant difference in ages of children assigned to the treatments? Apply the two sample z test at a 5% level of significance.
A researcher wonders if there is a difference in perfectionism across individuals who receive different amount of parental critism. She samples individuals and divides them into groups-no critism, w
Why is it important to specify the null and alternative hypothesis, along with the significance level, before the sample data is observed? ( More than one sentence please.
In a certain city 40% consider themselves Conservatives (C) 35% Liberals (L) and 25% Independents (I). During a particular election 45% of the conservatives voted 40% of the liberals voted and 60 %
Fred did a study to see if a psychiatric patients respond to a better to a certain kind of therapy. He arranged for patients to be randomly assigned to different therapy groups and monitored their d
Use this information to answer the next two questions. A researcher at a major hospital wishes to estimate the proportion of the adult population of the United States that has high blood pressure.
In 2010, 433,428 adult Texans were diagnosed with diabetes for the first time. What is the incidence of diabetes in Texas? Express your answer in units of per 1000 persons per year.