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沒有 【段考】國一自然上學期 權限，請先開通．

沒有 【段考】國一自然上學期 權限，請先開通．

沒有 【段考】國一自然上學期 權限，請先開通．

沒有 【段考】國一自然上學期 權限，請先開通．

複選題1. According to the central limit theorem, (A) The population mean and the mean of all sample means are equal. (B) Increasing sample size decreases the dispersion of the sampling distribution. (C) The sampling distribution of the sample means is approximately normally distributed. (D) The sampling distribution of the sample means will be skewed.

2. If 95% and 98% confidence intervals were developed to estimate the true cost of a MP3 player microwave, what differences would they have? (A) Standard errors (B) Interval widths (C) Z-statistic(D) Both b and c

3. A student was studying the political party preferences of a university's student population. The survey instrument asked students to identify their political preference, for example, democrat, republican, libertarian, or other party. The best way to illustrate the frequencies for each political preference is (A) Bar chart. (B) Pie chart. (C) Histogram. (D) Frequency polygon.

4. According to the Chebyshev rule, at least 75% of all observations in any data set are contained within a distance of how many standard deviations around the mean? (A) 1 (B) 2 (C) 3 (D) 4 

5. A manufacturer of flashlight batteries took a sample of 130 batteries from a day's production and used themn continuously until they were drained. The number of hours until failure are recorded. Given below is the boxplot of the number of hours it took to drain cach of the 130 batterics. The distribution of the number of hours is  (A) right-skewed (B) left-skewed (C) symmetrical (D) none of the above

6. If the critical z-value for a test statistic equals 2.45, what value of the test statistic would provide the least chance of making a Type I error? (A) 3.74 (B) 10,000 (C)2.46 (D)4.56

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