Many people can roll their tongues, but some can't. Javier is interested in determining the proportion of students at his school that can roll their tongue. In a random sample of 100 students, Javier determines chat 70 can roll their tongue. The dotplot below shows the proportion of people who can roll their tongue in each of 500 random samples of size 100 from a population where 70% can roll their tongue. Distribution of Simulated Proportion E samples SD mean 500 0.701 0.048 o ss 065 Simulated sample proportion of Yes 07 o 65 06 o75 3. Javier's biology teacher claims that 75% of people can roll their tongue. According to Javier's study, is this claim plausible? Explain.

A friend of yours tells you that they heard that 65% of all college athletes end up losing a finger or toe in their college athletic career.  You're highly skeptical of this, but your not sure if that percentage is an over exageration or an under exageration.  You survey 101 former student-athletes and find that 60 of them lost a digit during their college athletic career.  Is this enough evidence to conclude that the true percentage of student-athletes that lose a digit during their collegiate career is really different from 65%?

By a small margin, Facebook remains the top choice of social media over all ages, with 29% using Facebook most often among those using social media sites. However, more visually oriented social networks such as Snapchat and Instagram continue to draw in younger audiences. When asked "Which one social networking brand do you use most often?" the results in the table show the top brands chosen by Americans aged 12-34 who currently use any social networking site or service. Social M edia Site Faceboo k Snapchat Instagra m Twitter Percentage That Use Most Often 29 28 26 6 20 (a) What is the sum of the percentages for these top social media sites? Give your answer as an exact number. Macmillan Learning top social media sites: What percent of Americans aged 12-34 use other social media sites most often? Give your answer as an exact number. other social media sites: do %

4) Students in two fifth grades were given the same English test. One class of 27 students had a mean of 69 and the second class of 23 students had a mean of 74. What is the mean for the total number of students in both classes to the nearest 0.1?oielusiso pnidgst bomro

1. Explain the difference between z-tests (which use categorical data), and t-tests (which use numerical data). 2. Conduct a t-test, both when given statistics, and when given data. 3. Conduct a t-test, 2-sample t-test, and paired t-test. 4. Differentiate between the five types of tests we have learned so far.

There are 9 million enrollees in the Department of Veterans Affairs health care system. It wants doctors and nurses to treat pain as a “fifth vital sign” to be recorded along with blood pressure, pulse, temperature, and breathing rate. If you were to aid the VA in this situation, how would you measure a patient’s pain? How could this “fifth vital sign” be a potentially invalid measure? Answer each question with at least one paragraph of three complete sentences.

There are 15 numbers on a list, and the smallest number is changed from 4 to 0.4.a) Is it possible to determine by how much the mean changes? If so, by how much does it change?b) Is it possible to determine the value of the mean after the change? If so, what is the value?c) Is it possible to determine by how much the median changes? If so, by how much does it change?d) Is it possible to determine by how much the standard deviation changes? If so, by how much does it change

b)     A certain pay television company wishes to estimate the proportion of its customers who would  purchase a pay television program guide. To do this, the company manager decides to select a random  sample of customers and note the number who would purchase a program guide. Suppose that experience in other areas suggests that about 13% of customers will purchase a program guide.   How many customers should the company manager include in his sample if he wishes to estimate the true proportion who will purchase the program guide correct to within 5% (0.05) with a confidence level of 95%?

7. Wondering if there is a connection between a person's height and the number of tattoos they have, Mac asks 50 people how tall they are and how many tattoos they have. What type of study was used? a. Experimental b. Observational

Sierra College students enrolled in an online Elementary Statistics course were asked to participate in an anonymous onlne survey. The survey asked the students "Which type of device will you primarily use to access your online course in Canvas?". Of the 152 students who answered this question, 20 responded "a desktop computer", 121 responded "a laptop computer", 6 responded "a smartphone", and 5 responded "a tablet". The Sierra College Mathematics Department believes that less than 5% of students enrolled in an online Elementary Statistics course primarily uses a smartphone to access their online course in Canvas. Use the data collected in the survey to conduct a hypothesis testing procedure to test this belief. What conclusion should be reached according to the results of this hypothesis test?