According to national data, 38% of US adults have blood type O-positive. Suppose that a randomsample of 25 US adults is chosen.Use the Standard Deviation Rule and the properties of the sampling distribution of p-hat. There is a 68%chance that, in any random sample of 25 people, the proportion of people with blood type O-positive willbe between:O .1373 and.6227O .2829 and .4771.0888 and .6712O .3706 and .3894O .1858 and .5742 A survey administered to a random sample of 625 U.S. college students found that 125 out of the625 students surveyed were a member of a sorority or a fraternity.Use the appropriate formula from the provided formula sheet.Compute a 99% confidence interval for the proportion of U.S. college students who are a member ofa sorority or a fraternity. In the blank below, enter the upper bound of the 99% confidence interval for p.For example, if your confidence interval is (0.115, 0.276), the upper bound would be 0.276. Provide youranswer as a decimal rounded to three decimal places.

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Answered: According to national data, 38% of US…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Chicago area doctors are concerned about their female patients' systolic blood pressure since an above average to high blood pressure can be an indicator of heart disease or other serious conditions. The average systolic blood pressure for a Chicago woman is 135mmHg , with a standard deviation of 7.5mmHg. Suppose a random sample of 100 women is selected. Identify each of the following:
A Pew Research Center poll asked 1102 teenagers (12- to 17-year-olds) in the United States if they have a cell phone. Of the respondents, 71% said yes. Identify the population, the sample, and the sample statistic. Is the sampling distribution normally distributed? What is the mean and standard deviation of the sampling distribution? Find the cutoff for the highest 0.15% of sample proportions. Find the cutoffs for the middle 95% of sample proportions.
Suppose that heights of 10-year-old boys in the US vary according to a normal distribution with mean of 138 cm and standard deviation of 7. What is the probability that the height of a randomly selected boy is greater than 145 cm? a. 0.1357 b. 0.1151 c. 0.1841 d. 0.1587
Given a sample with a mean of 151 and a standard deviation of 27, find the probability that a randomly-selected data point from the sample will have a value greater than 158.0.
A certain brand of car tends to break down on average after 115,000miles with a standard deviation of 4800 miles. If 36 cars of this brand are sampled,find the probability that their average breakdown mileage is less than 113,500miles. a. 0.0301 b. 0.3783 c. 0.6217 d. 0.9699
Assume that the heights of men are normally distributed with a mean of 68.1inches and a standard deviation of 2.8 inches. If 64 men are randomly selected, find theprobability that they have a mean height greater than 69.1 inches.
In a recent study reported Oct. 29, 2012 on the Flurry Blog, the mean age of tablet users is 34 years. Suppose the standard deviation is 15 years. Take a sample of size n = 100. a. What are the mean and standard deviation for the sample mean ages of tablet users? b. What does the distribution look like? c. Find the probability that the sample mean age is more than 30 years (the reported mean age of tablet users in this particular study). d. Find the 95th percentile for the sample mean age (to one decimal place).
For a certain battery company, the life span of the batteries follows a normal distribution. What proportion of the batteries will last longer than 37 hours if the mean life is 35.4 hours with a standard deviation of 90 minutes? (A) 1.07 B) 14.23% C) 85.77% D) 37.77%
Suppose that in 2020 the average song length is 245 seconds, with a standard deviation of 28 seconds. what is the approximate standard error for the sampling distribution of mean song lengths due samples size of 64 A. 28.0 B. 2.3 C. 7.0 d. 3.5
The average time spent in transportation of randomly selected 48 households is 80.7 minutes per day with a standard deviation of 22.5 minutes. Estimate the true variation of the time spent in transportation of all households. Select one: O a. 80.7 22.5 O b. V48 O C.22.5 O d. 22.52 e. 22.5
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 181 lb. The new population of pilots has normally distributed weights with a mean of 136 lband a standard deviation of 29.6 lb. b. If 38 different pilots are randomly selected, find the probability that their mean weight is between 130 lb and 181 lb.
Records from the Washington Department of Licensing show that 47 former SFCC business students have incorporated their own businesses in the last five years. Eight of these students are selected at random and contacted. Each is asked how many people are employed by their corporation. The responses are: 7, 12, 13, 17, 10, 5, 10, and 6 employees. What is your best estimate of the standard deviation of the number of employees for all 47 corporations?

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