Some people seem to believe that you can fix anything with duct
tape. Even so, many were skeptical when researchers announced that
duct tape may be a more effective and less painful alternative than
liquid nitrogen, which doctors routinely use to freeze warts. An
article described a study conducted at a medical center. Patients
with warts were randomly assigned to either the duct tape treatment
or the more traditional freezing treatment.
Those in the duct tape group wore duct tape over the wart for 6
days, then removed the tape, soaked the area in water, and used an
emery board to scrape the area. This process was repeated for a
maximum of 2 months or until the wart was gone. Data consistent
with values in the article are summarized in the following
table.
Treatment | n |
Number with Wart Successfully Removed |
---|---|---|
Liquid nitrogen freezing | 101 | 60 |
Duct Tape | 103 | 88 |
Do these data suggest that freezing is less successful than duct tape in removing warts? Test the relevant hypotheses using a significance level of 0.01. (Use a statistical computer package to calculate the P-value. Use pnitrogen − pduct tape. Round your test statistic to two decimal places and your P-value to four decimal places.)
z | = |
P-value | = |
Below are the null and alternative Hypothesis,
Null Hypothesis, H0: p1 = p2
Alternate Hypothesis, Ha: p1 < p2
Test statistic
z = (p1cap - p2cap)/sqrt(pcap * (1-pcap) * (1/N1 + 1/N2))
z = (0.5941-0.8544)/sqrt(0.7255*(1-0.7255)*(1/101 + 1/103))
z = -4.17
P-value Approach
P-value = 0
As P-value < 0.01, reject the null hypothesis.
Some people seem to believe that you can fix anything with duct tape. Even so, many...
Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than liquid nitrogen, which doctors routinely use to freeze warts. An article described a study conducted at a medical center. Patients with warts were randomly assigned to either the duct tape treatment or the more traditional freezing treatment. Those in the duct tape group wore duct tape...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...