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(Solution) MATH225 Week 8 Assignment Coefficient of Determination

Question A scientific study on construction delays gives the following data table. Construction delay (hours) Increased cost ($1000) 51 104 55 103 58 89 61 56 63 52 Using technology, it was determined that the total sum of squares (SST) was 2542.8, the sum of squares regression (SSR) was 2194.8, and the sum of squares due to error (SSE) was 347.99. Calculate R2 and determine its meaning.…

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(Solution) MATH225 Week 7 Assignment Hypothesis Test for the Mean – Population Standard Deviation Known

Question Suppose a chef claims that her meatball weight is not equal to 4 ounces, on average. Several of her customers do not believe her, so the chef decides to do a hypothesis test, at a 10% significance level, to persuade them. She cooks 13 meatballs. The mean weight of the sample meatballs is 3.9 ounces. The chef knows from experience that the…

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(Solution) MATH225 Week 7 Assignment Conducting a Hypothesis Test for Mean – Population Standard Deviation Known P Value Approach

Question Shawn, a competitor in cup stacking, has a sample stacking time mean of 9.2 seconds from 13 trials. Shawn still claims that her average stacking time is 8.5 seconds, and the high average can be attributed to chance. At the 4% significance level, does the data provide sufficient evidence to conclude that Shawn’s mean stacking time is greater than 8.5 seconds? Given the sample…

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(Solution) MATH225 Week 7 Assignment Conduct a Hypothesis Test for Proportion – P-Value Approach

Question A researcher claims that the proportion of smokers in a certain city is less than 20%. To test this claim, a random sample of 700 people is taken in the city and 150 people indicate they are smokers. The following is the setup for this hypothesis test: H0:p=0.20 Ha:p<0.20 In this example, the p-value was determined to be 0.828. Come…

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(Solution) MATH225 Week 7 Assignment – Developing Hypothesis and Understanding Possible Conclusions for Proportions

Question Colin is a student in a statistics course looking to show whether the proportion of games played that are won by the visiting team in a certain professional lacrosse league is 50%. Colin randomly selects 83 games from the past few seasons and finds that 37 of the games were won by the visiting team. What are the null…

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(Solution) MATH225 Week 6 Assignment Understanding Confidence Intervals – Excel

Question In a city, 22 coffee shops are randomly selected, and the temperature of the coffee sold at each shop is noted. Use Excel to find the 90% confidence interval for the population mean temperature. Assume the temperatures are approximately normally distributed. Round your answers to two decimal places and use increasing order. ….Kindly click the purchase icon to…

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(Solution) MATH225 Week 6 Assignment Point Estimates, Margins of Error, and Confidence Intervals

Question Randomly sampled math majors at a large university were asked to take part in a survey about the curriculum. The dean wanted to find out how challenging the math coursework was for students. The proportion of math majors that stated the curriculum was challenging was 0.92, with a margin of error of 0.07. Construct a confidence interval for the…