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Homework: Trials in an experiment with a polygraph include 99 results that include 24 cases of wrong results and 75 cases of correct results. Use a 0.01 significance level to test the claim that such polygraph results are correct less than 80% of the time. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method. Use the normal distribution as an approximation of the binomial distribution. Let p be the population proportion of correct polygraph results. Identify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: p=0.20 H:p#0.20 0 C. Ho: p= 0.20 H:p>0.20 O E. Ho p=0.80 H:p*0.80 OB. Ho: p=0.20 H:p<0.20 D. Ho: p=0.80 H:p<0.80 - E Ho: p= 0.80 H,: p > 0.80 The test statistic is z = (Round to two decimal places as needed.)

Nineteen different video games showing violence were observed. The duration times of violence in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 86 sec, what does df denote, and what is its value? What does df denote? A. The sample size OB. The sample standard deviation VC. The number of degrees of freedom D. The test statistic The value of df is (Type an integer or a decimal. Do not round.)