第9章1標本による仮説検定
Homework宿題
Exercises 60練習問題 60
Exercise 60問題 60
The National Institute of Mental Health published an article stating that in any one-year period, approximately 9.5% of American adults suffer from depression or a depressive illness. Suppose that in a survey of 100 people in a certain town, seven of them suffered from depression or a depressive illness. Conduct a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population.
米国国立精神衛生研究所の記事は、任意の1年間に米国成人の約9.5%がうつ病または抑うつ性疾患を患うと述べている。ある町の100人を調査し、7人がこれらの疾患を患っていたとする。その町の真の比率が、米国成人全体の割合より低いかを調べる仮説検定を行え。
- Is this a test of one mean or proportion?これは1つの平均の検定か、比率の検定か。
- State the null and alternative hypotheses.
H0: ____________________ Ha: ____________________帰無仮説と対立仮説を示せ。H0:____________________。Ha:____________________。 - Is this a right-tailed, left-tailed, or two-tailed test?これは右片側検定、左片側検定、両側検定のどれか。
- What symbol represents the random variable for this test?この検定の確率変数を表す記号は何か。
- In words, define the random variable for this test.この検定の確率変数を言葉で定義する。
- Calculate the following:次の値を求める:
- x = ________________
- n = ________________
- = _____________
- Calculate σx = __________. Show the formula set-up.σx = __________を計算せよ。値を代入した公式も示せ。
- State the distribution to use for the hypothesis test.仮説検定に使う分布を示す。
- Find the p-value.p値を求める。
- At a pre-conceived α = 0.05, what is your:あらかじめα = 0.05と定めた場合、次の各項目を答える:
- Decision:判断:
- Reason for the decision:判断の理由:
- Conclusion (write out in a complete sentence):結論(完全な文で書く):
Level of Significance of the Test
検定の有意水準
probability of a Type I error (reject the null hypothesis when it is true). Notation: α. In hypothesis testing, the Level of Significance is called the preconceived α or the preset α.
第1種の過誤(真の帰無仮説を棄却する)の確率。αと表す。仮説検定では、事前に定めたα、または設定済みのαと呼ぶ。
p-value
p値
the probability that an event will happen purely by chance assuming the null hypothesis is true. The smaller the p-value, the stronger the evidence is against the null hypothesis.
帰無仮説が真と仮定した場合に、出来事が純粋な偶然で起きる確率。p値が小さいほど、帰無仮説に反する証拠は強い。