In a survey of 233 people about the operating systems of various devices that they use (cell phone, tablet, laptop, etc.), the following results were obtained: 146 people use an Android device 150 people use an Apple device 79 people use Android and Apple devices 77 people use Android and Windows devices 67 people use an Apple device, but no Windows device 32 people use Android, Apple, and Windows devices 8 people use devices that are not Android, not Apple, and not Windows How many people use a Windows device?

The figure to the right shows the results of a survey in which 1004 adults from Country A, 997 adults from Country B, 999 adults from Country C, 1000 adults from Country D, and 995 adults from Country E were asked whether national identity is strongly tied to birthplace. National Identity and Birthplace People from different countries who believe national identity is strongly tied to birthplace Country A 31% Country B 18% Country C 23% Country D 55% Country E 10% Construct a 95% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. The 95% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is (☐.) - (Round to three decimal places as needed.)

In a volunteer group, adults 21 and older volunteer from one to nine hours each week to spend time with a disabled senior citizen. The program recruits among community college students, four-year college students, and nonstudents. In the Table below is a sample of the adult volunteers and the number of hours they volunteer per week. Type of Volunteer 1–3 Hours 4–6 Hours 7–9 Hours Row Total Community College Students 111 96 48 255 Four-Year College Students 96 133 61 290 Nonstudents 91 150 53 294 Column Total 298 379 162 839 Table: Number of Hours Worked Per Week by Volunteer Type (Observed) The table contains observed (O) values (data). Is the number of hours volunteered independent of the type of volunteer? The observed table and the question at the end of the problem, "Is the number of hours volunteered independent of the type of volunteer?" tell you this is a test of independence. The two factors are number of hours…

Sixteen men and fourteen women in an Introductory Psychology class have taken their midterm exams. Their scores are listed here. (For gender, 1 = male and 2 = female).   Student       Gender        Score       Student      Gender       Score 1                      1                   85           16                2                      89                    2                      1                   53           17                2                      73 3                      2                   92           18                2                      91 4                      1                   70            19                1                      76        5                      1                   76            20                1                      75 6                      1                   93            21                2                      89 7                      1                    90           22                2                      71 8                      2…