Consider the following. (Give your answers correct to two decimal places.) (a) Calculate the test statistic z used in testing Ho: p = 0.70, Hạ: p > 0.70; with the sample n = 311 and x = 258. (b) Calculate the test statistic z used in testing Ho: p = 0.50, Hạ: p < 0.50; with the sample n = 448 and x = 206. (c) Calculate the test statistic z used in testing Ho: p = 0.35, Hạ: p # 0.35; with the sample n = 279 and x = 84. (d) Calculate the test statistic z used in testing Ho: p = 0.90, Hạ: p > 0.90; with the sample n = 547 and x = 514.

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13.

What is the standardized test statistic t for a sample with n = 12, xbar = 30.2, s = 2.2, and α = 0.01 if H0: µ =29?  Round your answer to the nearest thousandth.

Assume a population of 3, 4, and 11. Assume that samples of size n = 2 are randomly selected with replacement from the population. Listed below are the nine different samples. Complete parts a through d below. 3,4 3,3 a. Find the value of the population standard deviation o. S ▼ 3,11 ▼ ■ 1 | 4,3 4,4 C (Round to three decimal places as needed.) b. Find the standard deviation of each of the nine samples, then summarize the sampling distribution of the standard deviations in the format of a table representing the probability distribution of the distinct standard deviation values. Use ascending order of the sample standard deviations. Probability (Type integers or fractions.) c. Find the mean of the sampling distribution of the sample standard deviations. The mean of the sampling distribution of the sample standard deviations is. 4,11 11,3 11,4 11,11

What percentage of scores should fall within ±1 SD for TADHD? Choices: 1. A higher percentage of scores than fell within ±1 SD for ADHD 2. A lower percentage of scores than fell within ±1 SD for ADHD 3. The same percentage of scores that fell within ±1 SD for ADHD   What is true of a score of 65.55 for TADHD?   Choices:   1. It falls within –1.5 SD of the mean and is thus unlikely to be due to chance 2. It falls within 1.5 SD of the mean and is thus unlikely to be due to chance 3. It falls outside –1.5 SD of the mean but is likely to be due to chance 4. It falls outside 1.5 SD of the mean but is likely to be due to chance