The New York Department of Health conducted an investigation on the effect of a new vitamin supplement given to pregnant women. The results in the following table show the mean, standard deviation, and standard error of the birth weights (in kilograms) of a random sample of 16 male babies whose mothers took the vitamin supplement when pregnant. n mean std. deviation std. error Weight 16 3.675 0.657 0.164 Interpret the confidence interval in the terms of the problem.

Public Policy Polling (PPP), a reputable polling company, asked the following question in a previous Halloween-eccentric public opinion poll:“If zombies took over the world and human civilization collapsed, how long do you think you could survive: less than one week, less than one month, less than six months, less than one year, or more than a year?” Of the 1,200 likely voters who were asked this question, 324 said “Less than one week”.Do we know the true population percentage of likely voters who said that they would survive a zombie apocalypse for less than one week?

According to the Insurance Information Institute, the mean expenditure for auto insurance in the United States was $774 in 2002. An insurance sales person believes that the mean expenditure for auto insurance is different now. He obtains a random sample of 35 auto insurance policies and determines the mean expenditure to be $815 with a standard deviation of $88.31. Is there sufficient evidence to conclude that the mean expenditure for auto insurance is different from the 2002 amount at the α = 0.10 level of significance? State the null and alternative hypothesis for this situation, and the type of tail.

It is believed that applying zinc to soil can affect the amount of herbage (leaves and stems) of plants grown. In an experiment, the regression line for predicting the amount of herbage (y) from the amount of zinc applied (x) is y-hat = 3.29 – 3.825x.  Which of the following can you conclude from this regression line?

An ABC News poll in April 2007 of a random sample of 1002 adults nationwide asked about various measures the government could take to try to reduce future global warming (www.pollingreport.com/enviro.htm). When asked whether the government should increase taxes on gasoline so people either drive less or buy cars that use less gas, 681 people said no. Test, at the 0.01 level of significance, the claim that the majority (more than 50%) of U.S. adults believe that the government should not increase taxes on gasoline to help reduce future global warming.State the null and alternative hypothesis for this situation, and the type of tail.

Inferential statistics is so named because it allows us to examine a sample and make inferences about . . .

Which of the following sets of four numbers has the largest standard deviation?

A consulting statistician reported the results from a learning experiment to a psychologist. The report stated that on one particular phase of the experiment a statistical test result yielded a p-value of 0.24. Based on this p-value, which of the following conclusions should the psychologist make?

The box plots below illustrate the distribution of graduation rates for a sample of public universities and for a sample of private universities. Based on the box plots, which of the following statements is NOT true?

How many times should we gently invert the tubes to ensure proper blood/additive mix?