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

A researcher has a table of data with four column variables and three row variables. The value for the degrees of freedom in order to calculate the statistic is __________. 12 6 3 11 RATIONALE Recall to get the degrees of freedom we use df = (r-1)(c-1) where c and r are the number of rows and columns. This means df = (4-1)(3-1) = 3*2 =6. CONCEPT Chi-Square Test for Association and Independence 2 7/2/2020 Sophia :: Welcome What value of z* should be used to construct a...

Joe is measuring the widths of doors he bought to install in an apartment complex. He measured 72 doors and found a mean width of 36.1 inches with a standard deviation of 0.3 inches. To test if the doors differ significantly from the standard industry width of 36 inches, he computes a z-statistic. What is the value of Joe's z-test statistic? 2.83 -1.81 -2.83 1.81 RATIONALE 6/29/2020 Sophia :: Welcome If we first note the denominator of Then, getting the z-score we can ...

UNIT 4 — MILESTONE 4 - HEADMAN Score 15/18 You passed this Milestone 15 questions were answered correctly. 3 questions were answered incorrectly. 1 The table below shows the grade and reading level for 5 students. Grade Reading Level Student 1 2 6 Student 2 6 14 Student 3 5 12 Student 4 4 10 Student 5 1 4 For grade, the mean is 3.6 and the standard deviation is 2.1. For reading level, the mean is 9.2 and the standard deviation is 4.1. Using the formula below or Excel, find the...

Question 1 Which statement accurately describes the data's form, direction, and strength from the scatterplot below? Question 2 Raoul lives in Minneapolis and he is planning his spring break trip. He creates the scatterplot below to assess how much his trip will cost. Which answer choice correctly indicates the explanatory and response variables for the scatterplot?

UNIT 2 — MILESTONE 2 Score 24/26 24/26 that's 92% Well done! If you keep getting Milestone scores like this you'll pass the course. 24 questions were answered correctly. 2 questions were answered incorrectly. Milestone Tips Remember that Milestones are open-book. Take the Practice Milestone before taking the Milestone. Take the Milestone at a time and in a place where you can be focused and undisturbed for the entire Milestone time limit. 1 At Brent's school, the final grade fo...

Satara was having fun playing poker. She needed the next two cards dealt to be hearts so she could make a flush (five cards of the same suit). There are 10 cards left in the deck, and three are hearts. What is the probability that the two cards dealt to Satara (without replacement) will both be hearts? Answer choices are in percentage format, rounded to the nearest whole number. 2 Using the Venn Diagram below, what is the conditional probability of event Q occurring, assuming that ev...

Several scientific and statistical studies have been done to determine whether or not pollutants in soil increase the incidence of cancer. A study based on many previous studies summarizes that there is no link between pollutants in soil and cancer. This kind of statistical study is called a __________. Clinical trial Prospective study Matched-pair design Retrospective study RATIONALE Since the data has already been collected it is called a retrospective study design. CONCEPT Prosp...

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? Complete...

The administrator of a hospital conducted a survey among patients in the cardiology wing to determine service levels of the nursing staff in the hospital. Which of the following explains how the results of the survey could be biased?  The sample does not include the doctors of the hospital.  The sample does not include all the patients in the hospital.  The sample does not include the board members of the hospital.  The sample does not include the staff members of the hosp...

Introduction to Statistics Milestone 1 1 Jay wants to study nutrition and performance in schools using available data. Which of the scenarios below will provide Jay with available data? Going to a local high school and asking the principal for information about students' current and previous grades, then interviewing a random selection of students about their eating habits. Going to a local high school and asking the principal for information about students' previous grades, then intervie...