Use the following scenario to complete the question 6 and 7 A GlobalWeblndex stu
ID: 3074960 • Letter: U
Question
Use the following scenario to complete the question 6 and 7 A GlobalWeblndex study, as reported by TechCrunch, noted the percentage of adult Internet users that owned various devices. Suppose that a survey of 1000 adult Internet users found the 910 adult users own a computer, 80 own a smartphone, 470 own a tablet, and 90 own a smart watch. 6. Construct a 95% confidence interval estimate for the population proportion of the adult Internet users that own a mart watch. (keep 2 digits after the decimal place, e.g. 2.22) 7. Construct a 95% confidence interval estimate for the population proportion of the adult Internet users that own smartphone. (keep 2 digits after the decimal place, e.g. 2.22) Use the following scenario to complete the question 6 and 7 An information technology (IT) consulting firm specializing in health care solutions wants to study communication deficiencies in the health care industry. Previous researches reveal that the standard deviation of time wasted in a day due to outdated communication technologies is reported to be 10 minutes. A random sample of 70 health care clinicians reveals that the average time wasted in a day due to outdated communication technologies was 45 minutes. 8. what infomation can you get from the scenario above? a, -45, -10 b. n-45, p 10 c. X-bar 45, S-10 d. X-bar-45, -10 9, construct a 95% confidence interval estimate for the population mean time wasted in a day due to outdated communication technologies. (keep 2 digits after the decimal place, e.g. 2.22)Explanation / Answer
6)
z value at 95% = 1.96
p = 90/1000 = 0.09
CI = p +/- z *sqrt(p*(1-p)/n)
= 0.09 +/- 1.96 *sqrt(0.09*(1-0.09)/1000)
= (0.07 , 0.11)
7)
z value at 95% = 1.96
p = 80/1000 = 0.08
CI = p +/- z *sqrt(p*(1-p)/n)
= 0.08 +/- 1.96 *sqrt(0.08*(1-0.08)/1000)
= (0.06 , 0.10)
9)
Option a)
mu = 45 , sigma = 10
10)
z value at 95% = 1.96
CI = mean +/- z *(s/sqrt(n))
= 45 +/- 1.96 *(10/sqrt(70))
= (42.66 , 47.34 )