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Let a random sample be taken of size n = 36 from a population with a known standard deviation of =3. Suppose that the mean of the sample is . Find the 95% confidence interval for the mean, , of the
Also explain what the type I and II errors would be if you reached the incorrect conclusion in your test. Respond to at least two of your classmates' postings.
Which category, groceries or dining out, has a higher population mean annual credit card charge? What is the point estimate of the difference between the population means? What is the 95% confidence
Weights of newborn babies in a certain state have normal distribution with mean 5.33 lb and standard deviation 0.65 lb. A newborn weighing less than 4.85 lb is considered to be at-risk, that is, has
The lengths of pregnancies are normally distributed with a mean of 269 days and a standard deviation of 15 days. If 36 women are randomly selected, find the probability that they have a mean pregnan
Our sample size is 17. Which value most accurately represents the critical value of Z that you would use to plug in for your interval?
A newspaper publisher mails out a survey 6 months before a subscription expires. This survey asks its subscribers if they are going to renew. On average, 8% of the subscribers respond to the survey.
Sample for the proportion of the population that would favor a recount. What is the Point Estimate for the proportion of the population that would favor a recount?
If Punxsutawney Phil sees his shadow on February 2, then legend says that winter will last 6 more weeks. In 117 years, Phil has seen his shadow 103 times.
In order to test the hypothesis H0 : 1 = 2 = 3 = 4 at the 5% significance level, four test plots for each of the four varieties of corn are planted.
Find 95% confidence interval for the true proportion of all current Bank of America customers who would respond with a 9 or 10. Are we 95% confident that this proportion exceeds .48 the historical p
SmartMinds University is running a promotional raffle that offers a chance to win either a 1-year discount on tuition cost (which results in a $500 savings) or a 2-year discount on bookstore purchas
If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
A high school counselor wants to examine whether the teenage pregnancy rate at her school is different from the rate nationwide. She knows that the rate nationwide is 15 %. She randomly selects 80 f
You notice at the gym that it appears more women tend to work out together, whereas more men tend to work out alone. To determine whether this difference is significant, you collect data on the work
Waiting times were calculated to the nearest tenth of a minute for 100 randomly selected customers. The stem-and-leaf graph is from the 100 collected waiting times.
In a large corporation, 65% of the employees are male. A random sample of five employees is selected. Use the Binomial probability tables to answer the following questions.
the distribution is approximately normal. if an employee is picked at random, what is the probability that the employee has worked at the store for over 10 years?
A production process produces 90% non-defective parts. A sample of 10 parts from the production process is selected.
who perform community service will have higher Christian maturity scores. The maturity scores tend to be skewed (not normally distributed). Higher scores indicate higher Christian maturity.
A random sample of 15 workers finds that their mean travel time is = 22.5 minutes. What are the null and alternative hypotheses for testing whether the true mean is different from 20 minutes?
Participants indicate the degree of tastiness on a 10-point scale and the ratings appear in the following table. Tastiness scores tend to be skewed.
Twenty single men were chosen at random and were asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that seven (7) of the men say NO?
Of six cars produced at a particular factory between 8 and 10 a.m. last Monday morning, test runs, revealed three of them to be "lemons." Nevertheless, three of the six cars were shipped to dealer A
Approximately what percentage of household incomes in this state is between $27,000 to $63,000/year? Show all work as to how this is obtained.