People were polled on how many books they read the previous year. Initial survey results indicate that s = 18.3 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values. G (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject)

otected View - Saved to this PC Search View Help 12. The city council is considering a law that would ban smoking in all public facilities. A sample has been selected from the community and tested for of the ordinance. Is there a statistically significant relationship between age and support for the anti-smoking law? Use the five step model as a guide and write a sentence or two interpreting your results. support Age More than 40 Less than 40 Support: For 145 78 223 Against 103 248 169 247 272 495 A. Use probabilities to determine if these two variable are independent or dependent P (Less than 40) 3D P(Less than 40 | For)= P(Less than 40| Against) = Are age and support for the anti-smoking law independent? (Yes independent/No = not independent) B. Conduct a hypothesis test using an alpha of .05 that these variables are i

Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"

A survey was conducted that asked 1013 people how many books they had read in the past year. Results indicated that x=10.3 books and s=16.6books. Construct a 90​% confidence interval for the mean number of books people read. Interpret the interval.   Construct a 90​% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice. ​(Use ascending order. Round to two decimal places as​ needed.)   A. There is a 90​% probability that the true mean number of books read is between ___ and ____   B. There is 90​% confidence that the population mean number of books read is between ___ and ____.   C. If repeated samples are​ taken, 90​% of them will have a sample mean between ___ and ___.

People were polled on how many books they read the previous year. Initial survey results indicate that s = 11.9 books. Complete parts (a) through (d) below. A Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly halves the sample size. O B. Doubling the required accuracy nearly doubles the sample size. O C. Doubling the required accuracy nearly quarters the sample size. O D. Doubling the required accuracy nearly quadruples the sample size. (d)…

Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96

You are a researcher studying the antler size of male Alaskan Moose in a certain Alaska location.  You gather a random sample of 18 male moose and record the width (in feet) of the antlers. The data is displayed in the table below.  Estimate the mean antler width of all Alaskan male moose in this area.  Use a 90% confidence level.   3.6 5.6 3.4 3.4 4 5.2 4.6 4.3 4.6 4.6 2.2 6.4 3.6 3.1 5.4 4.4 3.3 4.3       a)  Find the confidence interval:   < μμ <   b) What is the margin of error of your interval?  c) Interpret your 90% confidence interval in context.

A survey was conducted that asked 1016 people how many books they had read in the past year. Results indicated that x = 11.8 books and s = 16.6 books. Construct a 99% confidence interval for the mean number of books people read. Interpret the interval. E Click the icon to view the table of critical t-values. Construct a 99% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete vour choice. (Use ascending order. Round to two decimal places as needed.) O A. If repeated samples are taken, 99% of them will have a sample mean between and. Table of Critical t-Values O B. There is a 99% probability that the true mean number of books read is between and. OC. There is 99% confidence that the population mean number of books read is between and . t-Distribution Area in Right Tail Degrees of Freedom 0.25 0.20 0.15 0.10 0025 00 0.01 0.005 0.0025 0.001 0.0005 1.376 1.963 1.061 1.386 0.978 1.250…

A survey was conducted that asked 963 people how many books they had read in the past year. Results indicated that x=14.7 books and s=17.8  books. Construct a 90​% confidence interval for the mean number of books people read. Interpret the interval.Construct a 90​% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice.​(Use ascending order. Round to two decimal places as​ needed.)A. If repeated samples are​ taken, 90​% of them will have a sample mean between ___ and ____                                B. There is a 90​% probability that the true mean number of books read is between ____ and ___                             C. There is a 90​% confidence that the population mean number of books read is between ___ and ___