to use the t distribution, you will first need to determine the degrees of freedom (df) for a = .05. The degr The critical value of t is mple of 16-year-old children with antisocial tendencies has an average score of 13.10 with a standard devia e the t statistic. To do this, you will first have to calculate the estimated standard error. The estimated stan . The t statistic is d error to calculate the t statistic.) . (Hint: For the most precise results, retain four significant figures from your atistic lie in the critical region. Therefore, you reject the null hypothesis.

T-TEST FOR INDEPENDENT MEANS 1. Two types of instruments for measuring the amount of sulfur monoxide in the atmosphere are being compared in an air pollution experiment. It is desired to determine whether the types of instruments yield measurement having the same variability. The following readings were recorded for the instrument. Sulfur Monoxide Instrument A Instrument B 0.86 0.87 0.82 0.74 0.75 0.63 0.61 0.55 0.89 0.76 0.64 0.70 0.81 0.69 0.68 0.57 0.65 0.53 Assuming the population of measurements to be approximately normally distributed, test the null hypothesis using two tailed test at 0.05 level of significance.

The time to complete an exam is approximately Normal with a mean of 50 minutes and a standard deviation of 8 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. u = 50 o = 8 μ- 3σ μ20 μ-σ H-20 H+ 20 u+3ơ

Calculate the correct t-statistics based on the information below.   X1 = 200   X2 = 198   n1 = 17   n2 = 17   s1 = 2.45   s2 = 2.35   Let us assume that two groups of students at Tarleton are being compared on their average weights. Do you think the groups are different in terms of weight (measured in pounds)?

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