Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
One study on slavery estimated that a slave had only 2% chance of being sold into the interstate trade each year. This estimate turns out to be based on auction records in Anne Arundel Country, Mar
One thousand people are enrolled in a 10-year cohort study. At the start of the study, 100 have diagnosed CVD. Over the course of the study, 80 people who were free of CVD at baseline develop CVD.
An advertisement claims that chewing NoCav gum reduces cavities. To test the claim, you conduct a study in which 100 participants who chew the gum are compared to the national average for cavities f
An urn contains nine white balls and 11 black balls. A ball is drawn and replaced. If the ball is white your opponent pays you 25 cents. If it is black you pay him 25 cents. You have one dollar and
A telephone survey commissioned by the New Zealand Health service found that 16% of New Zealanders consume more than 10 alcoholic beverages /week. The data were collected from random selection of 20
If the significance level = .10, then what is the probability of rejecting Ho when the null hypothesis is true?
Below is a table of observed values of sample comparing people's ages to their political affiliation. Construct the corresponding table of expected values for checking whether the variables are indepe
Discuss what satisfying assumption 1-3 for regression inferences by the variables under consideration would mean. An article examined the relationship between investments in mutal fund portfolios an
Develop a null hypothesis and an alternative hypothesis? If conducting this hypothesis testing at the significance level of 0.05, what is the critical value for this testing that you should be using
The annual percapita consumption of fresh apples in pounds in a nearby state can be approximated by a normal distribution with a mean of 16.9 pounds and standard deviation of 4.2 pounds. What is th
The amounts a soft drink machiene is designed to dispense for each drink are normally distributed, with a mean of 12.2 fluid ounces and a standard deviation of 0.3 fluid ounce. A drink is randomly
A doctor wants to estimate the HDL cholesterol of all 20-to 29- year-old females. How many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confidence assumming o=14.5?
In a survey of women in a certain country (ages 20-29), the mean height was 64.1 inches with a standard deviation of 2.99 inches. A random sample of 65 woman in this age group is selected. What is
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