A teacher was listening to some of her students talk about how many SnapChats they send during the day. The teacher decided that she wanted to conduct a study to see if the number of SnapChats a student sends per day affects how much time students talk to their friends face-to-face. So, the teacher let her 2nd period class continue sending Snaps as they always have. Then, the teacher told her 5th period that they were to not watch use SnapChat for a whole day. Then, the teacher had students record how many conversations they had with their friends during the week, gathered the data, and analyzed the results. d. What was the treatment?

Suppose you run a non-for-profit organization focused to keeping national parks free of litter. Crucial to getting donations to your non-for-profit is email advertising. One way to measure the success of your email advertising is to measure the amount of money coming from links to donate on your emails. Normally, your emails contain only words and numbers about litter in national parks. You believe that including images of littered areas of national parks might increase the amount in donations that you get through emails. To test if this is true, you randomly assign 50 individuals to receive the new email format with images and 42 to receive your usual email format (this is called an A/B test). The new email format had an average donation per recipient of$5.50 with a standard deviation of$2.75 while the old email format had an average donation per recipient of$3.50 with a standard deviation of$2.50. Does the average donation differ between the new and old email formats? Letμ1be the…

In Nigeria, with the monsoon, there was a drastic increase in cases of Malaria. Peniguillin is a medicine most used to treat cases of malaria. A secret report got leaked which showed the results of clinical trials of Peniquillin. Among the subjects treated with Peniguillin, 52 had nausea and 175 showed no symptoms of nausea. Among the other subjects were given placebos, 5 had nausea and 40 showed no symptoms of nausea. The lab sends its results to you to test for a difference between the rates of nausea for those treated with peniguillin and those given a placebo. The lab has few questions which you need to answer: 1) which hypothesis is the right OC? How about the conclusion, which box to choose? Choose :

An instructor gave students the option to purchase an interactive program that allows them to answer questions during class and receive credit for participating. Alternatively, students could work an extra problem during weekly homework assignments. The instructor randomly selected 10 students, then randomly divided them into two groups of five each. One group was provided the interactive tool, the other group was asked to work the extra problem. The instructor knew from prior experience that the interactive tool increases attendance. The table below contains the final exam scores for the 10 students (on a scale from 0 to 100). Interactive: 65 78 84 88 96 Extra problem: 56 61 70 75 82 The instructor wishes to test whether increased attendance throughout the semester leads to improved exam scores. Let µ I = mean score that would be observed if all students used the interactive tool and µ E = mean score if all students worked an extra problem. The hypothesis to be tested is image: µ I…

As the leader of the sales team, you would like to increase the revenue brought by your team. You discovered a program for sales personnel that supposedly improve         As the leader of the sales team, you would like to increase the revenue brought by your team. You discovered a program for sales personnel that supposedly improve interpersonal skills and thus help settle deals with customers more often. You decide to send8 of your sales people for the training, and compare the amount they brought in sales in the month before they went and in the month after they received the training. The data are:Xbefore: 400, 300, 1200, 2100, 700, 450, 650, 3400Xafter: 1000, 400, 1000, 2500, 1200, 600, 800, 3000   C. Calculate 95% confidence intervals for the estimate of the difference.

My kid wants to know if sledding down the hill is more fun as you have more people piled on the sled with you. She sleds down the hill on her own (making a mental note of how fun it is on a scale of 1 (super lame) to 10 (wheeeeeeeee). She has her friends do the same but with various numbers of passengers (1,2,3,4) on their sleds (again making meticulous mental notes on the fun index). 1) 1 sample t-test 2) Z- SCOre 3)Correlation 4)chi square test of independence

Sarah chose to live on the honors floor of her dorm because she was told that the students on that floor would be quiet and studious. She was told that students on the honors floor study 10.5 hours per week. After living on the honors floor for a few months, Sarah is convinced that the students around her study less than 10.5 hours a week. To test her claim, Sarah polls 10 students on her floor regarding the number of hours per week that they spend studying. Use the results in the table below to test Sarah’s claim at the 0.05 level of significance. Assume that the population distribution is approximately normal. hours of study: 12,4,14,9,8,6,10,12,11,9

In a recent article published by Scientific American found that only 82% of Millennials are certain the world is round. That seems low to you, you believe that more than 82% of Millennials believe the world is round. You randomly sample 75 Millennials and find that 68 of them believe the earth is round. The others didn't necessarily believe it is flat they might just be unsure of the earth's shape. Use your choice of Excel or Ti Calculator to complete a one proportion Z-test at 0.01 significance level. If using Excel, copy and Paste the appropriate Excel calculator into the sheet labeled Proportions.  Or if using Ti Calculator, type an explanation of the Ti Calculator features you used and include the Z test statistic, and the p-value.

A recent study examined the drinking behaviors of undergraduate college students (male and female freshmen). Each participant was asked how many alcoholic beverages they consumed during the past 7 days. The researchers wish to determine if there is a difference in the drinking habits of males and females in this age group. A recent study examined the drinking behaviors of undergraduate college students (male and female freshmen). Each participant was asked how many alcoholic beverages they consumed during the past 7 days. The researchers wish to determine if there is a difference in the drinking habits of male and females in this age group.  Female Male 9 13 5 9 5 7 9 11 8 10 3 5 5 6 2 10 1 16 7 12 Which type of test will you run? What is the independent variable? What is the dependent variable?

One of the basketball coaches at Cypress College wanted to see if Cypress College's Strength & Exercise class was increasing the weight that a player could bench press. The basketball coach randomly selected some of his players and determined how much they could bench press before taking the class. Then after completing the class, he again determined the weight that they could now bench press. The data for these players is given in the table below. Test whether the Strength and Exercise class is increasing the amount of weight that the players can bench press at the a=0.05 level of significance. Player Player 1 Player 2 Player 3 Player 4 Pounds Lifted Before 205 241 338 368 [ Select] ANOVA 2-SampFTest 252 330 360 2-SampTTest X^2-Test 2-PropZTest T-Test [ Select ] P-Value [ Select] Conclusion