Writing Assignment 4

the superintendent of a school district decided to collect data on the effectiveness of two methods of teaching reading: the whole word approach and phonics. She randomly assigned half of the elementary schools (n=10) to the whole world approach for teaching reading and half to phonics (n=10). The results are as follows: Whole world  m= 77.3 ss= 336.1   Phonics m= 89 ss= 266 1. Use a two tailed test with alpha= .01 to determine whether these data are sufficient to conclude that there is a significant difference between using the whole word and the phonics approach to reading. 2. Compute cohen's d to measure the size of the effect. 3. Which method would you reccomend that the school district adopt for teaching reading and why?

This problem is based on information taken from The Merck Manual (a reference manual used in most medical and nursing schools). Diltiazem is a commonly prescribed drug for hypertension. However, diltiazem causes headaches in about 12% of patients using the drug. It is hypothesized that regular exercise might help reduce the headaches. If a random sample of 205 patients using diltiazem exercised regularly and only 15 had headaches, would this indicate a reduction in the population proportion of patients having headaches? Use a 1% level of significance. 1. What is the value of the sample test statistic? (Round your answers to two decimal places.) 2. Find the P-value of the test statistic. (Round your answers to four decimal places.)

Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. Cloud seeding has been studied for many decades as a weather modification procedure (for an interesting study of this subject, see the article in Technometrics, "A Bayesian Analysis of a Multiplicative Treatment Effect in Weather Modification", Vol. 17, pp. 161-166). The rainfall in acre-feet from 20 clouds that were selected at random and seeded with silver nitrate follows: 17.0, 29.7, 18.8, 26.1, 21.3, 17.8, 30.8, 22.4, 20.2, 26.9. 30.9, 26.1, 24.0, 23.7, 25.9. 20.8, 28.2, 33.8, 25.7, 30.6 (a) Can you support a claim that mean rainfall from seeded clouds exceeds 24.0 acre-feet? Use a = 0.01. There is V evidence to indicate that the true mean rainfall is greater than 24.0 acre-feet at a = 0.01. (b) Compute the power of the test if the true mean rainfall is 26.0 acre-feet. i Round your answer to one decimal place (e.g. 98.7). (c) What sample size would be required to…

This problem is based on information taken from The Merck Manual (a reference manual used in most medical and nursing schools). Diltiazem is a commonly prescribed drug for hypertension. However, diltiazem causes headaches in about 11% of patients using the drug. It is hypothesized that regular exercise might help reduce the headaches. If a random sample of 206 patients using diltiazem exercised regularly and only 17 had headaches, would this indicate a reduction in the population proportion of patients having headaches? Use a 1% level of significance.   (a) What is the level of significance?State the null hypothesis  H0  and the alternate hypothesis  H1 . H0 : p          H1 : p         (b) What sampling distribution will you use? The standard normalThe Student's t     since np               and nq               What is the value of the sample test statistic? (Round your answers to two decimal places.)(c) Find the P-value of the test statistic. (Round your answers to four decimal…

You've conducted a k-means cluster analysis and in your output you have the following average within-cluster distances for each cluster: Cluster 1: 0.946 Cluster 2: 1.332 Cluster 3: 0.865 Cluster 4: 1.098 From these average within-cluster distances, which cluster is the most homogeneous?   Question 3 options:   Cluster 1   Cluster 2   Cluster 3   Cluster 4

Professional Athlete Salaries. From the Statistical Abstract of the United States and the article  “Average Salaries in the NBA, NFL, MLB and NHL” by J. Dorish, published on the Yahoo! Contributor  Network, we obtained the following data on average professional athletes’ salaries for the years 2005 and 2011.

I submitted this question a couple of days ago but some helper said that they didn't know how to do it and says it needs a data set but my professor said this question doesn't need a data set.

A source table has the following information: Three treatment conditions with a sample of n =7 participants in each treatment. You know SS(BW) = 20 and MS(WI) = 2. What is the missing value for MS(BW)? Answer choices: 40, 10, 2, 5 You have an ANOVA source table with the following information: Three treatment groups with a sample of n = 10 participants in each treatment. You also know the SS(BW) =20 and F = 5.00. What is the missing value for SS(Total)? Answer choices: 74, 54, 30, 22 For an experiment involving 2 levels of factor A and 3 levels of factor B with a sample of n = 5 in each treatment condition, what is the value for df(WI)? Answer choices: 30, 29, 24, 20

2.86 Shaft graves in ancient Greece. Refer to the American O Journal of Archaeology (Jan. 2014) study of sword shaft SHAFTS graves in ancient Greece, Exercise 2.60 (p. 61). The num- ber of sword shafts buried at each of 13 recently discovered grave sites is reproduced in the following table. 1 2 3 1 5 6 2 4 1 2 4 2 9 Source: Harrell, K. "The fallen and their swords: A new explanation for the rise of the shaft graves." American Journal of Archaeology, Vol. 118, No. 1, January 2014 (Figure 1). a. Calculate the range of the sample data. b. Calculate the variance of the sample data. c. Calculate the standard deviation of the sample data.

2. [modified from page 76 #3] Coughlin et al. examined the breast and cervical screening practices of Hispanic and non-Hispanic women in counties that approximate the U.S. southern border region. The study used data from the Behavioral Risk Factor Surveillance System surveys of adults age 18 years or older conducted in 1999 and 2000. The table below reports the number of observations of Hispanic and non-Hispanic women who had received a mammogram in the past 2 years cross-classified with marital status. Marital Status Currently Married Divorced or Separated Widowed Never Married or Living As an Unmarried Couple Total Hispanic 319 130 88 41 578 Non-Hispanic 738 329 402 95 1564 Total 1057 459 490 136 2142 a) We select at random a subject who had a mammogram. What is the probability that she is widowed? b) We select at random a subject who had a mammogram and learn that she is Hispanic. With that information, what is the probability that she is married? e) Def two vents in this space that…

The authors of the paper "Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement" compared two different instruments for measuring a subject's ability to breathe out air.+ (This measurement is helpful in diagnosing various lung disorders.) The two instruments considered were a Wright peak flow meter and a mini-Wright peak flow meter. Seventeen subjects participated in the study, and for each subject air flow was measured once using the Wright meter and once using the mini-Wright meter. Mini- Subject Wright Meter 1 2 3 4 5 6 7 8 9 512 430 520 428 500 600 364 380 658 Wright Meter 494 395 516 434 476 557 413 442 650 Subject 10 11 12 13 14 15 16 17 Mini- Wright Meter 445 432 626 260 477 259 350 451 Wright Meter 433 417 656 267 478 178 423 427 (a) Suppose that the Wright meter is considered to provide a better measure of air flow, but the mini-Wright meter is easier to transport and to use. If the two types of meters produce different readings but there is a…

You also conducted a review of the research literature and found that similar studies examining the relationship between alcohol consumption and liver cancer found the following: Smithson et al. RR 3.3 (95% CI:1.95-5.20)  Ribera et al. RR 2.1 (95% CI:1.17-3.33)  Gonzalez et al. RR 2.75 (95% CI 2.26-3.45) Which one of Hill’s criteria does this illustrate? Explain.

The data is presented in parallel format.  Before running the ANOVA in Excel, you will need to put it into serial (column) format.  You will need to create a categorical variable for the first factor (days) and for the second factor (time of day). This is a critical step.The data presented shows exam scores for students randomly assigned to the sections meeting on these days at these times of the day: Thursday Friday   Morning    Afternoon    Morning    Afternoon  70.878.15978.246.646.476.559.376.370 65.678.359.359.778.680.892.780.865.392.3 90.890.569.177.36977.558.677.877.558.6 63.372.854.254.472.166.26372.56672.2 Conduct a 2-way ANOVA.  First, find the group means for each level of the factors.  (Report answers accurate to 2 decimal places.)Days:    MThursday=MThursday=     MFriday=MFriday= Time of day:    Mmorning=Mmorning=     Mafternoon=Mafternoon= Report the results of the ANOVA for the main & interaction effects.  (Report P-values accurate to 4 decimal places and…

my answer for part b) of 6.24 was: (4.3, 9.26) so the variability in Hours is equal to 4.3 hours to 9.26 hours and in minutes its 258 to 555.6 minutes. I also posted 6.24 the previous exercise so that you have all the information but I need help with 6.25.

The 5-year incidence of cardiovascular disease (CVD) in relation to smoking status was determined in a population sample of 1000 men, 18 years and older. At baseline, 30% of the men were classified as being current smokers and 70% as being non-smokers. At the end of the follow-up, 60 CVD events had occurred among the smokers and 70 events among the non-smokers. Construct a 2 x 2 table based on the data provided