Sophia Milestone 1 Statistics Questions and Answers Already Passed

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28 questions were answered correctly. 1 question was answered incorrectly. 1 In a survey of small business owners, a response to which of the following questions would be qualitative? What type of... business do you own? How much did your business have in profits last year? How long have you owned a business? How many businesses do you own? RATIONALE All the other options are numeric measures and can be used in arithmetic. The type of business you have is simply a descriptive measure and is therefore qualitative. CONCEPT Qualitative and Quantitative Data 2 Nick designs a clinical trial to test a new anxiety medication by creating a control group and a treatment group. If he gives the medication to patients in the treatment group and not to the control group, some patients might find out that they're not being treated. To improve his study, Nick decides to give a sugar pill to the control group. The sugar pill is an example of a __________. placebo confounding variable variable of interest case control RATIONALE When no active treatment is given to the control group, we refer to this as the placebo. CONCEPT Placebo 3 10/3/2020 Sophia :: Welcome https://strayer.sophia.org/spcc/introduction-to-statistics-2/milestone_take_feedbacks/6433148 2/14 A survey was conducted to find the frequency with which people go to the movies. A group of 120 people in a mall were asked about how often they go out for a movie and It was found that 36 people go to movies at least once in a month. Which of these is an example of descriptive statistics? 30% of the people who reside in the city go to movies at least once in a month. 30% of the people who reside in the county go to movies at least once in a month. 30% of the people surveyed in the mall go to movies at least once in a month. 30% of the people who visited the mall go to movies at least once in a month. RATIONALE Recall a descriptive statistic is a summary figure from a sample, which is the information at hand. From this survey a statistic would be 36 of 120 people or 30% go to the movies at least once in a month. CONCEPT Statistics Overview 4 A new pet food product for small dogs has been developed to help with tooth decay. Fifty-two dogs participate in the study. Each dog owner picks a card from a standard deck out of a hat. If the card is red, their dog will be in the treatment group. If the card is black, their dog will be in the placebo group. Which experimental design was used? Randomized Block Design Case-Control Design Completely Randomized Design Matched-Pair Design RATIONALE Since all dogs are assigned treatment or control randomly by picking a card without considering other factors, this is called a completely randomized design. CONCEPT Completely Randomized Design 5 A scientist is conducting a study on the effect of eating chocolate and overall mood. They believe that gender is a significant factor. The participants are divided by gender. Then, within each group, participants are randomly assigned to consume either chocolate or a placebo and then rate their mood for the day. This experiment will run for two weeks. Which type of experimental design does this situation describe? Case-Control Design Completely Randomized Design Matched-Pair Design 10/3/2020 Sophia :: Welcome https://strayer.sophia.org/spcc/introduction-to-statistics-2/milestone_take_feedbacks/6433148 3/14 Randomized Block Design RATIONALE Since women are randomly assigned chocolate or placebo, this is a completely randomized design. CONCEPT Randomized Block Design 6 A local school newspaper's editor wants to survey students to determine the approval rating of the current student council president. How would the newspaper apply the cluster sampling method to find this information? The newspaper staff surveys every student in a randomly selected grade. The newspaper staff surveys random students from every grade in the school. The newspaper staff surveys only the female students in the entire school. The newspaper staff surveys 30 students from each grade in the school. RATIONALE Recall that sometimes natural arrangements or clusters form which generally are geographic. In this case, each grade level represents a cluster of students in a grade level. From each grade level or cluster, we then select a random sample. CONCEPT Stratified Random and Cluster Sampling 7 Jessica uses a poorly calibrated stopwatch to note the finish time of a relay race. She noted the time as 125 seconds, whereas the actual time taken was 120 seconds. The percent error in Jessica's calculation is __________. [Show More]

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