At Brighton Middle School, Mr. Yule asked 50 randomly selected students from each grade level about their favorite subject,
and 12 chose science. He used this data to draw the inference that about 25% of middle school students will indicate science
is their favorite subject. If there are 200 students all together, did he make a reasonable inference?
No. Mr. Yule's sample is biased and too small to be representative of the population
Yes. Mr. Yule's sample is small and biased, so it is representative of the population
No. Mr. Yule's percentage is too large. He should have used 6%.
Yes, Mr. Yule's sample is random and representative of the population
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Atest of sobriety involves measuring the subject's motor skills. a sample of 31 randomly selected sober subjects take the test and produce a mean score of 64.4 with a standard deviation of 2. a claim is made that the true mean score for all sober subjects is equal to 65. for each part below, enter only a numeric value in the answer box. for example, do not type "z =" or "t =" before your answers. round each of your answers to 3 places after the decimal point. (a) calculate the value of the test statistic used in this test. test statistic's value = (b) use your calculator to find the p-value of this test. p-value = (c) use your calculator to find the critical value(s) used to test this claim at the 0.2 significance level. if there are two critical values, then list them both with a comma between them. critical value(s) =