please help as soon s possible

In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the portion of the brain responsible for long-term memory storage, in adolescents. The researchers randomly selected 14 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm" . An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x = 8.11 cm" and s = 0.8 cm . Conduct the appropriate test at the a = 0.01 level of significance State the null and alternative hypotheses. Ho: H = 1 Hy: 1 $ 1 Type integers or decimals. Do not round.)A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 700.8. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 45 high-income individuals and found the sample mean credit score to be 716.5 with a standard deviation of 83.8. Conduct the appropriate test to determine if high-income Individuals have higher credit scores at the a = 0.05 level of significance. State the null and alternative hypotheses. HO: H * 1 (Type integers or decimals. Do not round.)The average daily volume of a computer stock in 2011 was u = 35.1 million shares, according to a reliable source. A stock analyst believes that the stock volume in 2014 is different from the 2011 level. Based on a random sample of 40 trading days in 2014, he finds the sample mean to be 28.2 million shares, with a standard deviation of s = 13.4 million shares. Test the hypotheses by constructing a 95% confidence interval. Complete parts (a) through (c) below. (a) State the hypotheses for the test. Ho: H 35.1 million shares H1: H 35.1 million shares