MGBA - 520 Quiz 4

Question 7

question(8):  A researcher was interested in the effect in the effect of job security on stress. The researcher recuited  10 pairs and seperated them into two groups, those who had job security, and those on a 1 year contract. The pairs were matched based on age, gender and education level. The researcher  measured the stress hormone  control through a salvia sample .  Is  this an independent study design?

Que Question 12 of 12 -/1 Multi View Policies Que Multi Current Attempt in Progress Suppose we are interested in comparing the proportion of male students who smoke to the proportion of female students who smoke. We have a random sample of 150 students (60 males and 90 females) that includes two variables: Smoke = "yes" or "no" and Gender = Qu Mult "female (F)" or "male (M)." The two-way table below summarizes the results. Qu Smoke = Yes Smoke = No Sample Size Mult Gender = M 51 60 Qu Mul Gender = F 81 90 Qu Use the estimate of the standard error to construct a 95% confidence interval for the difference in the proportion of smokers between male and female students, pm – Pf. Round the margin of error to three decimal places. Provide an interpretation of the interval in the Mull context of this data situation. Qu Mul i to i We are 95% sure that the difference in the proportion of smokers between male and female students is between Qu Mat and i . (Write your answers in ascending order.)…

experiment is conducted on the effect of alcohol on perceptual motor ability. Ten subjects are each tested twice, once after having two drinks and once after having two glasses of water. The two tests were on two different days to give the alcohol a chance to wear off. Half of the subjects were given alcohol first and half were given water first. The scores of the 10 subjects are shown below. The top number for each subject is their performance in the "water" condition. Higher scores reflect better performance. Test to see if alcohol impaired test scores. Subject 1 2 3 4 5 6 7 8 9 10 Water 16 15 11 20 19 14 13 15 14 16 Alcohol 13 13 10 18 17 11 10 15 11 16 t-value = p-value =

Do people walk faster in the airport when they are departing​ (getting on a​ plane) or do they walk faster when they are arriving​ (getting off a​ plane)? A reputable researcher measured the walking speed of random travelers in two International Airports. His findings are summarized in the table. Complete parts ​(a)-(c) below. ​(a) Is this an observational study or a designed​ experiment? Why?     A. This is an observational study since the researcher influenced the data.   B. This is a designed experiment since the researcher influenced the data.   C. This is an observational study since the researcher did not influence the data.   D. This is a designed experiment since the researcher did not influence the data.   (b)Explain why it is reasonable to use​ Welch's t-test.   A.The samples are​ random, small and independent.   B.The populations are normally distributed.   C.The samples are​ random, large and independent.   (c)The samples are​ random, large and…

Question(13): The researcher decided to conduct the study again and selected an additional 10 children from the full time kindergarden  and an additional 10 children from partime kindergarden.This time they matched the children in full time and part time based on SES, gender, age and vocabulary scores. They based their hypotheses on the finding from a previous study and wanted to see if  children who attended full time kindergarden would have better  short term memory recall comparred to children who attended partime kindergarden. Researcher read a list of 20 words then waited for two minutes, as the children had snacks, then ask then to tell them as many words as the could from the list of 20 words. Those who remember got a score of 1. Here is a summary of the result. full time kindergarden:    15      9        10     8    11     7       14   12     11     13 part time kindergarden:  10      7          9      8     12    6        8     10     7        9 Test the hypothses at (alpha…

pls help

solve c and d only

Oh no! Our expert couldn't answer your question. Don't worry! We won't leave you hanging. Plus, we're giving you back one question for the inconvenience. Here's what the expert had to say: Hi and thanks for your question! Unfortunately, per  Question 1b   The St. Lucian Government is interested in predicting the number of weekly riders on the public buses using the following variables: • Price of bus trips per week The population in the city The monthly income of riders Average rate to park your personal vehicle         City  Number of weekly riders Price per week Population of city Monthly income of riders Average parking rates per month 1 192,000 $15  1,800,000 $5,800 $50 2 190,400 $15  1,790,000 $6,200 $50 3 191,200 $15  1,780,000 $6,400 $60 4 177,600 $25  1,778,000 $6,500 $60 5 176,800 $25  1,750,000 $6,550 $60 6 178,400 $25  1,740,000 $6,580 $70 7 180,800 $25…

A biologist wished to study the effects of ethanol on sleep time. A sample of 80 rats, matched for age and other characteristics, was selected, and each rat was given an oral injection having a particular concentration of ethanol per body weight. The rapid eye movement (REM) sleep time for each rat was then recorded for a 24-hour period. The results are summarized in the side-by-side boxplots below. (a) How is the amount of ethanol given related to the median REM sleep time? Explain.(b) Does the amount of ethanol given affect the variability of REM sleep time? Explain.(c) What amount of ethanol given leads to the most skewed distribution of sleep times?(d) Is the distribution of REM sleep times for the rats given 2 g/kg ethanol symmetric, skewed left,or skewed right?

Why is the lab technician potentially a confounding variable in the study? What is the best explanation for the answer? Thanks!