AP STATS CHAPTER 9-10-11 KHANS(AT LEAST THE ONES THAT CONFUSED ME!)

AP STATS CHAPTER 9-10-11 KHANS(AT LEAST THE ONES THAT CONFUSED ME!) A sociologist studying fertility in Venezuela and Colombia wanted to test if there was a difference in the average number of babies women in each country have. The sociologist obtained a random sample of women from each country. Here is a summary of their results: Ans- The P-value is greater than a=.10 and they cannot conclude that there is a difference between the means. Felipe works at a factory that uses two independent production lines—line A and line B—to fill bottles with a beverage. He runs a daily test on separate random samples from each line to see if there is a difference in the average filling amounts (in milliliters) between the two lines. Here are results from the most recent test: Ans- Yes, since the P-value is less than .05 Ignacio grows two varieties of apples—Honeycrisp and Gala. He took a sample of each variety to test if their mean weights were significantly different. Here is a summary of his results (weights are shown in grams): Ans- The P-value is less than a=.10, and he should conclude that there is a difference between the means. A sociologist studying fertility in France and Switzerland wanted to test if there was a difference in the average number of babies women in each country have. The sociologist obtained a random sample of women from each country. Here are the results of their test: Ans- No, since the P-value is greater than .05 Preston teaches at an international school. After reading an article about the distribution of the world's population by continent, he wanted to test if the distribution of students in his school was similar. He collected information about all 320 students in his school. Here are the results: Preston wants to perform an x-squared goodness-of-fit test to determine if these results suggest that the distribution of students doesn't match the reported distribution. Ans- EC=1.6 Nina wanted to test if her 6-sided die was fair. In other words, she wanted to test if some sides get rolled more often than others. She rolled the die 60 times and recorded how often each side was rolled. Here are her results: What is the expected count of rolls to land showing a 3? Ans- 60/6=10