A report announced that the median sales price of new houses sold one year was $231,000,and the mean sales price was $271,600.Assume that the standard deviation of the prices is $90,000. Complete parts(a)through(d)below. ·○ (a) If you select samples of n=2,describe the shape of the sampling distribution of X. Choose the correct answer below. OA.The sampling distribution will be approximately uniform. O B.The sampling distribution is skewed to the right,but less skewed to the right than the population. OC.The sampling distribution will be approximately normal. OD.The sampling distribution will depend on the specific sample and will not have a constant shape.

A report announced that the median sales price of new houses sold one year was $231,000,and the mean sales price was $271,600.Assume that the standard deviation of the prices is $90,000. Complete parts (a)through(d)below. (d) If you select a random sample of n=100,what is the probability that the sample mean will be between $280,000 and $290,000? The probability that the sample mean will be be between $280,000 and $290,000 is (Round to four decimal places as needed.)

The distribution of hourly sales for a local family owned store is normally distributed with a mean of $225 per hour and a standard deviation of $75 per hour. Which of the following intervals contains the middle 95% of hourly sales

The distribution of amount spent per purchase in 2020 at Japanese convenience stores, called konbini, is skewed to the right with mean 670 Japanese yen and standard deviation 360 yen. A random sample of 36 customer receipts from all purchases at konbini in 2020 was selected, and the mean purchase amount was calculated. Suppose the process of randoml selecting 36 customer receipts from purchases at konbini in 2020 was repeated to obtain the sampling distribution of the sample mean. Which of the following is the best description of this distribution? (A) The distribution is skewed to the right with mean 670 yen and standard deviation 360 yen. (B) The distribution is skewed to the right with mean 670 yen and standard deviation 60 yen. (C) The distribution is approximately normal with mean 670 yen and standard deviation 60 yen. (D) The distribution is approximately normal with mean 670 yen and standard deviation 36 yen. (E) The distribution is approximately normal with mean 670 yen and standard deviation 10 yen.

In a sample of 41 U.S. adults aged 18-24 who celebrate Halloween, the mean amount spent on a costume was $43.3 with a standard deviation of $14.9. Round answers to at least 4 decimal places.a) What parameter are we estimating? b) We can work this problem because: c) What is the point estimate of that parameter? d) What is the standard deviation of the sampling distribution for the sample means? e) Find the margin of error for a 90% confidence interval for the true average amount spent on a costume. f) We are 90% confident that the true average amount spent on a Halloween costume for U.S. adults aged 18-24 is between $ and $. Do not round between steps, and round answer to 4 decimal places.

In a certain country, retirement age is known to follow a left-skewed distribution with a mean value of 63.78 years and a standard deviation of 3.89 years. Suppose we take a random sample of 17 members of this country, and calculate their average age at retirement. What is the probability that this sample has an average value of at most 63.88 years?Give your answer to four decimal places. If the question cannot be answered with the information given, enter -1 as your answer.