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Problems #65 - #94 from page 311. Please provide your answer after each problem and submit the file with your answers through Blackboard.

So, we have a distribution with a mean of 20,000 and a standard deviation of 5,102.

2. In order to determine the average amount spent in November on Amazon.com a random sample of 144 Amazon accounts were selected. The sample mean amount spent in November was $250 with a standard deviation of $25. Assuming that the population standard deviation is unknown, what is a 95% confidence interval for the population mean amount spent on Amazon.com in November?

(a) Then mean of the sample and the value of Z with an area of 10% in right tail.

Let’s assume you have taken 1000 samples of size 64 each from a normally distributed population. Calculate the standard deviation of the sample means if the population’s variance is 49.

The mean birth weight of infants born at a certain hospital in the month of April was 128 oz. with a standard deviation of 10.2 oz. Which of the following is a correct interpretation of standard deviation?

Body weight expressed as a percentage of ideal in an SRS of n = 9 girls selected at random are as follows {114, 100, 104, 94, 114, 105, 103, 105, 96}. Calculate a 95% confidence interval for the population mean µ.

7. Question : In a frequency distribution such as a bell-shaped curve, what does the vertical height of the curve indicate?

An intelligence test for which the scores are normally distributed has a mean of 100 and a standard deviation of 15. Use this information to describe how the scores are distributed.

across the two choice groups by conducting a study with six limited choice options and 24

2. For the following set of scores, fill in the cells. The mean is 74.13 and the standard deviation is 9.98.

The customers in this case study have complained that the bottling company provides less than the advertised sixteen ounces of product. They need to determine if there is enough evidence to conclude the soda bottles do not contain sixteen ounces. The sample size of sodas is 30 and has a mean of 14.9. The standard deviation is found to be 0.55. With these calculations and a confidence level of 95%, the confidence interval would be 0.2. There is a 95% certainty that the true population mean falls within the range of 14.7 to 15.1.

1. In a poll, respondents were asked if they have traveled to Europe. 68 respondents indicated that they have traveled to Europe and 124 respondents said that they have not traveled to Europe. If one of these respondents is randomly selected, what is the probability of getting someone who has traveled to Europe?

4) The Problem Set #1 (only the question solutions portion) is due at the end of the day on September 24th.

Company conducted a survey in order to determine the segmentation of people who would like to prefer fragrance and moisturizing cream in the skin care products they use.