Exam 9: The Single-Sample T Test

The following data were collected from a veterinarian's office over the course of a day to assess the average weight of dogs (in pounds): 10, 5, 17, 22, 50, 32, 38, and 29.What is the standard deviation for these data, first without the correction and then with the correction used when estimating a population?

The t test is a parametric statistical test that allows one to generalize what was learned about one sample to a larger population.

If the standard deviation for a population, as estimated from a sample, is s = 3.8, then the standard error for a sample size of N = 16 is s_M =:

The symbol representing a standard deviation calculated by using a sample to estimate the population standard deviation is:

It is known that the population mean on the math portion of the SAT is 500, with a standard deviation of 100.Assume that the average math SAT score for freshmen entering your college is 550, with a standard deviation of 110.Does the math performance of students entering your college differ from that of all individuals taking the SAT? What statistical analysis is used to answer this question?

Which report of statistical results is in appropriate APA format?

A team of researchers conducted a single-sample t test and found that the 95 percent confidence interval around their sample mean includes the value of the population mean.Based on this, they should conclude that:

Dot plots are identical to scatterplots.

For a one-tailed t test, there is only one critical cutoff value.

When performing a single-sample t test, an effect size of 0.80 would be interpreted as a _____ effect.

When the population mean falls in our confidence interval, we conclude that the sample:

A researcher conducts a single-sample t test and finds statistical significance at the 0.01 level.The effect size is then calculated and found to be 0.04.What might be concluded about the findings?

A t statistic is _______ as a z statistic, making it _______.

Assume that the national credit card interest rate is 12.83 percent.A study of 62 college students finds that their average interest rate is 14 percent with a standard deviation of 9.3 percent.What is the 95 percent confidence interval for this single-sample t test?

The single-sample t test compares a sample mean to a population mean when:

When scientists call a hypothesis test conservative, they mean that it:

As the sample size becomes larger, the t distributions become:

The third step in conducting the single-sample t test is:

According to the Consumer Action group, the average credit card interest rate in 2010 was 12.83 percent (based on a sample of 39 cards).A researcher wanted to know if college students at her institution have different interest rates compared to this national statistic.If conducting a single-sample t test, which statement would serve as her research hypothesis?

A researcher collects 25 data points that yield a mean of 8.164 and a standard deviation (based on N - 1) of 2.237.If the researcher is comparing the sample to a population mean of 9.2, what is the 95 percent confidence interval?