1. "It is known that under regular circumstances the population of 2 year old children has an average weight of = 26 pounds. The distribution of weights is normal with = 4. The researcher selects a random sample of n = 4 newborn infants and instructs the parents to provide each child with extra handling. The research predicts that the extra handling will stimulate the infants' growth and produce an increase in their weight at age 2.The researcher records the weight of each child at age 2 and obtains a sample mean of X = 29.5 pounds. State the null and alternative hypothesis."

2. "National IQ testing studies give a = 100 and = 15. A random sampling of the Biotech class gives the following IQ results for 9 students: 116, 128, 125, 119, 89, 99, 105, 116, 118. Are the Biotech students smarter than the average student?"

3. "A research study to determine if diabetic people are overweight measured % of ideal body weight. The data collected from 18 diabetics showed an average % of ideal body weight of 112.778 and a sample standard deviation of +/- 14.424.Are diabetic people overweight?"