1.5pointseBookPrintReferencesCheck my workCheck My Work button is now enabledItem 2Exercise 10-7 (Algo) (LO10-4, LO10-5)A recent national survey found that high school students watched an average (mean) of 7.6 movies per month with a population standard deviation of 0.9. The distribution of number of movies watched per month follows the normal distribution. A random sample of 39 college students revealed that the mean number of movies watched last month was 7.1. At the 0.05 significance level, can we conclude that college students watch fewer movies a month than high school students?

Suppose that the bollywood movie industry wants to know how often college students go to the movies. Sixteen college students are selected at random from a city and asked how many movies they have seen in theater in the previous year. The data are as follows: 7, 13, 0, 10, 2, 8, 4, 11, 0, 5, 16, 6, 2, 12, 9, 0. Suppose that the national average for movie visits per person in a year is 9.0 and standard deviation is 4.0. a. State the NULL and Alternative hypothesis.b. Test statistically whether college students' habit of watching movie in theatre is significantly different from the population? The 95% region of acceptance for the test-statistic is [-1.96 : 1.96].

A study was conducted to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours.A similar study conducted a year earlier estimated that μ, the mean number of weekly hours that U.S. adults use computers at home, was 8 hours. We would like to test (at the usual significance level of 5%) whether the current study provides significant evidence that this mean has changed since the previous year.Using a 95% confidence interval of (7.7, 9.3), which of the following is an appropriate conclusion? The current study does provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls outside the confidence interval. The current study does not provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls outside the confidence interval. The current study does provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls inside the confidence interval. The current study does not provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls inside the confidence interval. You cannot draw a conclusion because the only way to reach a conclusion is to find the p-value of the test.

Each of 7 students reported the number of movies they saw in the past year. This is what they reported.19, 19, 6, 11, 18, 7, 13Find the mean and median number of movies that the students saw.If necessary, round your answers to the nearest tenth.

A statistics professor implemented an online homework system for their introductory statistics  courses and wanted to know whether the system improved test scores.  In the Fall semester, homework was completed with pencil and paper, checking answers in the back of the book. In the Spring semester, homework was completed online – giving students instant feedback on their work. The results are summarized below.  Assume that the sampled populations are normal with equal variances.  Fall Semester(pencil and paper)Spring Semester(online system)Number of Students1416Mean Test Score73.477.4Sample Standard Deviation10.211.1  Is there evidence to suggest that the online system improves test scores? Use α = 0.05. Here  μ1𝜇1 = true mean score under pencil and paper system, and  μ2𝜇2  = true mean score under online system.

A simple random sample of seven (7) students is selected, and the students are asked how much time they spent studying for their University subjects (combined) outside class times. From past experience, it is known that these times (in hours) are distributed normally.The times (in hours) for the sample of students are as follows:2.3 7.2 4.5 12.5 6.6 2.5 5.5Based on these results, a confidence interval estimate for the population mean is found to be 5.9 ± 2.6.The level of confidence the researcher has used is closest to:-Group of answer choices95%90%97.5%99%