A study found that 80% of teenagers use social media on a regular basis. John wants to investigate if the proportion of students at his large high school who use social media is different. He takes a random sample of 90 students and finds that 63 of them use social media on a regular basis. Which hypotheses would test if the proportion of students at his high school who use social media on a regular basis is different than 0.80?

A school administrator claims that 85% of the students at his large school plan to attend college after graduation. The statistics teacher at this school selects a random sample of 50 students from this school and finds that 76% of them plan to attend college after graduation. The administrator would like to know if the data provide convincing evidence that the true proportion of all students from this school who plan to attend college after graduation is less than 85%. What are the values of the test statistic and P-value for this test? Find the z-table here. z = –1.78, P-value = 0. 0375 z = –1.78, P-value = 0. 0750 z = 1.78, P-value = 0.0375 z = 1.78, P-value = 0. 0750

A new study shows that 35% of adults have never been married. To test if that is a true claim, we randomly sampled 250 adults is collected and 97 of them have never been married. Test if the true population proportion of adults that have never been married is 35% or not. Use a 5% level of significance. Using decision from the previous problem. What is the correct conclusion for this test?     There is enough evidence to show that population proportion of adults that have never been married is more than 35%.     There is not enough evidence to show that population proportion of adults that have never been married is 35% or not.     There is not enough evidence to show that population proportion of adults that have never been married is 35%.     There is enough evidence to show that population proportion of adults that have never been married is 35% or not.

Any basketball fan knows that Shaquille O’Neal, one of the NBA’s most dominant centers of the last twenty years, always had difficulty shooting free throws. Over the course of his career, his overall made free-throw percentage was 53.3%. During one offseason, Shaq had been working with an assistant coach on his free-throw technique. During the next season, a simple random sample showed that Shaq made 26 of 39 free-throw attempts. Test the claim at the 0.05 SL that Shaq has significantly improved his free-throw shooting.

Any basketball fan knows that Shaquille O'Neal, one of the NBA's most dominant centers of the last twenty years, always had difficulty shooting free throws. Over the course of his career, his overall made free-throw percentage was 53.3%. During one off-season, Shaq had been working with an assistant coach on his free-throw technique. During the next season, a simple random sample showed that Shaq made 26 of 39 free- throw attempts. Test the claim that Shaq has significantly improved his free-throw shooting using a 0.05 significance level. What is the probability of Z obt? (round to the nearest thousandth)

It is claimed that the average amount of time boys and girls (age between 7 and 11) spend playing each day is the same. A child psychologist believes that boys, on average, spend more time playing sports than girls. He randomly selected 60 girls and 95 boys and observed their play time on sports. From his samples he found that girls have spend on average 2.6 hours, and boys have spent on average 3.9 hours playing sports. It is found that the time spent playing sports is normally distributed for girls with a standard deviation of 0.34 hours and for boys with a standard deviation of 1.53 hours. Is this day sufficient to support the psychologist claim? Do the test at 5% level of significance. Assume girls belong to population 1 and boys belong to population 2. Data given in this question are:     y-bar1 = 2.6, y-bar2 = 3.9, sigma1 = 0.34, sigma2 = 1.53     mu1 = 2.6, mu2 = 3.9, sigma1 = 0.34, sigma2 = 1.53     y-bar1 = 2.6, y-bar2 = 3.9, s1 = 0.34, s2 = 1.53     mu1 = 2.6,…

It is believed that 11% of all Americans are left-handed. A college needs to know how many left-handed desks to place in the big lecture halls being constructed on its campus. In a random sample of 290 students from that college, whether or not a student was left-handed was recorded for each student. The college wants to know if the data provide enough evidence to show that students at this college have a higher percentage of left-handers than the general American population? Describe the sample statistic, population parameter, and hypotheses. State the Type I and Type II errors in the context of this problem.    The sample statistic in context is as follows: Select an answer The mean number of all students from that college that are left-handed. The percentage of 290 randomly selected students from that college that are left-handed. 11% of all students from that college are left-handed. Whether or not a randomly selected student from that college is left-handed. The percentage of all…

Labor Day was created by the U.S. labor movement over 100 years ago. It was subsequently adopted by most states as an official holiday. In a poll by Gallup, 1000 randomly selected adults were asked whether they approve of labor unions; 650 said yes.   In 1936, about 72% of Americans approved of labor unions. At a 5% level of significance, do the data provide sufficient evidence to conclude that the percentage of Americans who approve of labor unions now has decreased since 1936?   Solve using the critical-value approach.   Define the parameter we are testing and setup a hypothesis test to see if less than 72% of Americans approve of labor unions currently.                   Calculate the test statistics for this hypothesis test.                     What is the critical value for this hypothesis test?

Many people like to play app based games on their mobile devices. Suppose we would like to estimate the proportion of students that have played an app-based game on their mobile device in the last month at CSU Stan. In order to do this, we take a random sample of 225 students and ask them if they have played an app-based game in the last month. Of those sampled, 198 responded that they have played an app-based game in the last month. Which of the following is the correct 99% confidence interval for the estimate of the proportion of all CSU Stan students that have played an app-based game in the last month? O [82.42%, 93.58%] O [6.42%, 17.58%] [83.75%, 92.25%] O [84.44%, 91.56%]

Any basketball fan knows that Shaquille O'Neal, one of the NBA's most dominant centers of the last twenty years, always had difficulty shooting free throws. Over the course of his career, his overall made free-throw percentage was 53.3%. During one off-season, Shaq had been working with an assistant coach on his free-throw technique. During the next season, a simple random sample showed that Shaq made 26 of 39 free- throw attempts. Test the claim that Shaq has significantly improved his free-throw shooting using a 0.05 significance level. Do you retain or reject the null hypothesis? Retain the null. Reject the null. Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Module 6--Assig....pdf PainNormalitylinf...pdf DIC. étv 9国回。 13 G Buscar o escribir URL