1)
a) p1-p2
b) sample #1 ----->
first sample size, n1= 30
number of successes, sample 1 = x1=
17
proportion success of sample 1 , p̂1=
x1/n1= 0.5667
sample #2 ----->
second sample size, n2 = 46
number of successes, sample 2 = x2 =
24
proportion success of sample 1 , p̂ 2= x2/n2 =
0.5217
level of significance, α = 0.10
Z critical value = Z α/2 =
1.645 [excel function: =normsinv(α/2)
Std error , SE = SQRT(p̂1 * (1 - p̂1)/n1 + p̂2 *
(1-p̂2)/n2) = 0.1167
margin of error , E = Z*SE = 1.645
* 0.1167 = 0.1919
confidence interval is
lower limit = (p̂1 - p̂2) - E =
0.045 - 0.1919 =
-0.147
upper limit = (p̂1 - p̂2) + E = 0.045
+ 0.1919 = 0.237
c) option B)
========================
2)
a) p̂ = x/n = 0.4720
b) z -value = Zα/2 = 1.960
[excel formula =NORMSINV(α/2)]
Standard Error , SE = √[p̂(1-p̂)/n] =
0.0393
margin of error , E = Z*SE = 1.960
* 0.0393 = 0.0771
95% Confidence Interval is
Interval Lower Limit = p̂ - E =
0.472 - 0.0771 =
0.395
Interval Upper Limit = p̂ + E = 0.472
+ 0.0771 = 0.549
From public records, individuals were identified as having been charged with drunken driving not less than...
From public records, individuals were identified as having been charged with drunken driving not less than 6 months or more than 12 months from the starting date of the study. Two random samples from this group were studied. In the first sample of 26 individuals, the respondents were asked in a face-to-face interview if they had been charged with drunken driving in the last 12 months. Of these 26 people interviewed face to face, 10 answered the question accurately. The...
A study considered the question, 'Are you a registered voter?" Accuracy of response was confirmed by a check of city voting records. Two methods of survey were used: a face-to-face interview and a telephone interview. A random sample of 85 people were asked the voter registration question face to face. Of those sampled, seventy-six respondents gave accurate answers (as verified by city records). Another random sample of 90 people were asked the same question during a telephone interview. Of those...
photos for each question are all in a row (1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
Read “Instituionalizing our Demise: America vs Multiculturalism” by Roger Kimball on pg 268 and “Reinventing America” Call for a new national indentity” by Elizabeth Martinez on pg 275. Create a double entry notebook for each reading selection It should be atleast five observation and responses. wric 268 PART 2 essay pro. exactly how and why their authors disagree. Instead of with parties in conflict as mediators do, you will nt of view designed to appeal to both sides, mediatn posing...