Sophia introduction to statistics Guides d'étude, Notes de cours & Résumés

RATIONALE Using the z-chart to construct an 88% CI, this means that there is 6% for each tail. The lower tail would be at 0.06 and the upper tail would be at (1 - 0.06) or 0.94. The closest to 0.94 on the z-table is between 0.9394 and 0.9406. 7/2/2020 Sophia :: Welcome 0.9394 corresponds with a z-score of 1.55. 0.9406 corresponds with a z-score of 1.56. Taking the average of these two scores, we get a z-score of 1.555. CONCEPT Confidence Intervals 3 A market research company conducted...

Recall that we have n = 7, so the df = n-1 = 6. So if we go to the row where df = 7 and then 0.025 for the tail probability, this gives us a value of 2.447 or 2.45. Recall that a 95% confidence interval would have 5% for the tails, so 2.5% for each tail. We can also use the last row and find the corresponding confidence level (see 95%). CONCEPT How to Find a Critical T Value 5 A market research company conducted a survey of two groups of students from different schools. They found that s...

A trainer is studying the effects of vitamin D on his athletes. He has realized that there are many potential confounding factors, such as gender and age. To limit the effect of these confounding variables, he decided to first group two athletes together based on these variables (for example, two 21-year-old males). Then he randomly assigned one person to receive the vitamin D and the other to receive a sugar pill. What type of experimental design does this situation demonstrate? Completely...

Sophia Learning: Introduction to Statistics Unit 5 Practice Questions and Answers Provided

Sophia Learning: Introduction to Statistics Final Milestone Questions and Answers Provided

Sophia Learning: Introduction to Statistics Unit 5 Milestone Questions and Answers Provided

Sophia Learning: Introduction to Statistics Unit 4 Practice Questions and Answers Provided

Sophia Learning: Introduction to Statistics Unit 3 Milestone Questions and Answers Provided

Sophia Learning: Introduction to Statistics Unit 4 Milestone Questions and Answers Provided

Sophia Learning: Introduction to Statistics Unit 3 Practice Questions and Answers Provided