You want to know more about the time scuba divers practice their diving skills. Before you take a sample you formulate the null hypothesis and the alternative hypothesis as follows: H0: μ = 400 minutes Ha: μ ≠ 400 minutes Based on a simple random sample of 100 scuba divers you find a mean of 380. Based on a significance test with α = 0.01 you don't reject the null hypothesis. What could have happened
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Explanation:
Module 1 - Exploring Data Question 1 A researcher wants to measure physical height in as much detail as possible. Which level of measurement does s/he employ? 1. Nominal level 2. Ordinal level 3. Interval level 4. Ratio level Question 2 You conduct a study on eye color and you question 550 people. 110 of them have brown eyes and 44% of them have blue eyes. What percentage of the people you questioned has blue or brown eyes? [Your answer should consist of just the number, no additional characters - so if you think the answer is 41% enter the number 41] Question 3 In which situation is a bar graph preferred over a pie chart? 1. When the number of categories in the data is high. 2. When the number of categories in the data is low. 3. When one of the categories in the data is really large. 4. When there are some large categories in the data. Question 4 Ten students completed an exam. Their scores were: 5, 7, 2, 1, 3, 4, 8, 8, 6, 6. What is the interquartile range (IQR)? 1. 4 2. 5 3. 5.5 4. 8 Question 5 A researcher wants to know what people in Amsterdam think of football. He asks ten people to rate their attitude towards football on a scale from 0 (don't like football at all) to 10 (like football a lot). The ratings are as follows: 1, 10, 6, 9, 2, 5, 6, 6, 5, 10. What is the standard deviation? 1. 9.3 2. 6.0 3. 9.2 4. 3.1 Question 6 You find a z-score of -1.99. Which statement(s) is/are true? 1. 1.99 people scored higher than the person in question. 2. The standard deviation of the test is negative. 3. The score falls below the mean score. 4. The score lies almost two standard deviations from the mean.
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