Public Opinion reported that 5% of Americans are afraid of being alon night. If a random sample of 20 Americans is selected, find the
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- Please in details and ASAPA public opinion poll in Ohio wants to determine whether registered voters in the state approve of a measure to ban smoking in all public areas. They randomly select 50 voters from each county in the state and ask whether they approve or disapprove of the measure.This is an example ofA multiple- choice test consist of 10 question . Each question has answers choices of a, b, c, d and e , and only one of the choices is correct . If a student randomly guesses on each question, what is the probability that he gets fewer than 3 of them correct?
- According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 individuals from argentina who died recently are selected at random. The 225 individuals lived an average of 77.4 years with a standard deviation of 6.7 years. Records of 300 individuals from Ireland who died recently are selected at random and independently. The 300 individuals lived a mean of 76.5 years with a standard deviation of 5.3 years. Assume that the population standard deviations of lifetimes in these two countries can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90% confidence interval for , the difference between the life expectancy in the United States and…A random semple of n,= 144 people ages 16 to 19 were taken from the kland of Dahu, Hawall, und B were found to be high school dropouts. Another random sample ef n,-131 people ages 16 to 19 were taken frem Sweeteater County, wyomng, and 11 were found to be hgh sdool dropouts. Do theme data Indicate that the population proportion of high school dropouts on Oahu is different (ether way) from that of Sweetwwater County? Use a 1% level of stgniticance. (a) what is the level of ugniicance? State the nul and altemate hypotheses O Hi P, = Pai H: P, P2 (b) what samping distribution will you use? What assumptions are you making? O The standard normal. The number of trials is sufficiently large. O The standard normal. we assume the population distributions are approximately normal. O The Student's t. We assume the population distributions are approximately normal. O The Student's t. The number of trials is suffidently laroe. what is the value of the sample test statastic? (Test the difference p,…A group of students consisting of 20 males and 20 females were selected to participate in a research study. If the students were selected using random sampling, what is the probability of picking a female student?
- Suppose 20% of business majors major in finance. You take a random sample of 3 business majors. What is the chance that only one of them majors in finance? (write the answer in three decimal places)A coach is interested in how many slam dunks the average college freshman at his university can do. Ten volunteers from the senior class step forward. After observing their performance, the coach concluded that college seniors can do an average of 10 slam dunks in a row without missing. what is the sample? what is the population?If there are 11 people in the first sample and 10 people in the second sample, the degrees of freedom for the first sample is type your answer... and type your answer... for the second sample.
- As part of a statistics project, a teacher brings a bag of marbles containing 700 white marbles and 300 red marbles. She asks her students to determine how many red marbles are in the bag without counting them.A student randomly draws 100 marbles from the bag. Of the 100 marbles, 33 are red.The target population consists of The 100 marbles drawn by the student The 1000 marbles in the bag None of the above The 33 red marbles drawn by the student The 300 red marbles in the bag The sample consists of The 1000 marbles in the bag The 100 marbles drawn by the student The 33 red marbles drawn by the student None of the above The 300 red marbles in the bag Based on the sample, the student would estimate that ------ marbles in the bag were red.based on the results of a poll, the probability of a random person liking ice cream is 0.84. suppose you flip a fair coin and ask a random person if they like ice cream. what is the probality that the person likes ice cream and the coin shows heads?To collect data about the number of students in your high school who have a part time job, which of the following methods is most likely to lead to a sample that is the most representative of the students in your school? Interview all the girls in the school. Ask the principal. Interview all the students in 9th grade. Assign each student in the school a number and randomly select students to be interviewed. Interview all the students who are on the sports teams in the school.
