Chapter 1. Stating Hypotheses

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Stat Tutor
true
true

Question 1

0:54

Question 1.1

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Incorrect. We compute probabilities on statistics and statistic values, not on parameters and parameter values. So, we conclude a claim about a parameter is incorrect when the probability of getting a statistic at the value observed is very small.
Correct. We compute probabilities on statistics and statistic values, not on parameters and parameter values. So, we conclude a claim about a parameter is incorrect when the probability of getting a statistic at the value observed is very small.
Incorrect. Try again.
2

Question 2

1:52

Question 1.2

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Incorrect. The symbol for the null hypothesis is H0.
Correct. The symbol for the null hypothesis is H0.
Incorrect. Try again.
2

Question 3

2:38

Question 1.3

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Incorrect. µ represents the mean of all bottles of chocolate milk filled by the machine.
Correct. µ represents the mean of all bottles of chocolate milk filled by the machine.
Incorrect. Try again.
2

Question 4

3:53

Question 1.4

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

Questions 5-6

5:06

Question 1.5

NsLlirhmo7ZKbqGiuNB2NLxTQWPjtkOseikCtSasKzKtIhRhhO1caDFwaUyDP1yZr5xKF6xJSI1hBgGGgImJAWVWpibcNbQzCsz/KyDoGfBYvyGir2hLycKZxWn8jCFWK0vyRkRR6yy3NwjF8Hef3ezs2DmEYZWsohinKw==
Incorrect. We usually wish to find evidence "against" the null hypothesis.
Correct. We usually wish to find evidence "against" the null hypothesis.
Incorrect. Try again.
2

Question 1.6

YSxFBqYVrnMFVBdHpK4iOaQ9WFHldBwHS/81yvLstQhrfR+hJETUq9krka0Y9BFfcprsd9jCI0Z+2rXv2NFBbcNGHfkRZY/zXmwlvdca6S7TT53xblOlQm+nD5pmCD3pt8SENTji8ldvR3KQBSuFg9S6vQ/biE39XKxiWZb3E7F7JPF4GCKBFyZJOC5ijGKh
Incorrect. Since we wish to decide whether the mean is "greater than" 16, we use the "greater than" symbol: ">" in Ha.
Correct. Since we wish to decide whether the mean is "greater than" 16, we use the "greater than" symbol: ">" in Ha.
Incorrect. Try again.
2

Question 7

5:37

Question 1.7

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Incorrect. Since we wish to decide whether the mean is "less than" 16, we use the "less than" symbol: "<" in Ha.
Correct. Since we wish to decide whether the mean is "less than" 16, we use the "less than" symbol: "<" in Ha.
Incorrect. Try again.
2

Question 8

6:10

Question 1.8

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Incorrect. Since we wish to decide whether the mean is "changed from" 16, we use the "not equal to" symbol: "\( \neq \)" in Ha.
Correct. Since we wish to decide whether the mean is "changed from" 16, we use the "not equal to" symbol: "\( \neq \)" in Ha.
Incorrect. Try again.
2

Question 9

8:34

Question 1.9

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Incorrect. Since we wish to decide whether the mean is "less than" 75.6, we use the "less than" symbol: "<" in Ha.
Correct. Since we wish to decide whether the mean is "less than" 75.6, we use the "less than" symbol: "<" in Ha.
Incorrect. Try again.
2

Question 10

8:58

Question 1.10

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Incorrect. “<” or “>” in Ha is a one-sided test.
Correct. “<” or “>” in Ha is a one-sided test.
Incorrect. Try again.
2

Question 11

9:44

Question 1.11

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Incorrect. Since we wish to decide whether the mean is “greater than” 3, we use the “greater than” symbol: “>” in Ha.
Correct. Since we wish to decide whether the mean is “greater than” 3, we use the “greater than” symbol: “>” in Ha.
Incorrect. Try again.
2

Question 12

9:59

Question 1.12

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Incorrect. “<” or “>” in Ha is a one-sided test.
Correct. “<” or “>” in Ha is a one-sided test.
Incorrect. Try again.
2

Question 13

10:41

Question 1.13

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Incorrect. Since we wish to decide whether the mean has “changed from” 11.5, we use the “not equal to” symbol: “\( \neq \)” in Ha.
Correct. Since we wish to decide whether the mean has “changed from” 11.5, we use the “not equal to” symbol: “\( \neq \)” in Ha.
Incorrect. Try again.
2

Question 14

11:00

Question 1.14

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Incorrect. "\( \neq \)" in Ha is a two-sided test.
Correct. "\( \neq \)" in Ha is a two-sided test.
Incorrect. Try again.
2

Question 15

12:33

Question 1.15

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Incorrect. Hypotheses are claims about parameter values, so parameter symbols must always be used in hypotheses. Statistic symbols are NEVER to be used in hypotheses.
Correct. Hypotheses are claims about parameter values, so parameter symbols must always be used in hypotheses. Statistic symbols are NEVER to be used in hypotheses.
Incorrect. Try again.
2