Exam 19: Introduction to Hypothesis Testing

Which statement is NOT true about a null hypothesis?

What does the following expression represent, where µ₁ is the symbol for the population mean for one group and µ₂ is the symbol for the population mean for the other group? H₁: µ₁ > µ₂

the null hypothesis is a possible explanation for an observed difference when there are sampling errors.

What type of hypothesis states that one particular group's average is higher than the other group's?

Which symbol shows that there is no difference between two means?

What type of hypothesis states that the true difference between the means in the population is zero?

Which hypothesis states that a mean difference between two groups is due to sampling error?

In each of the following situations, please identify the NULL HYPOTHESIS and the ALTERNATIVE HYPOTHESIS A group of 100 athletes were randomly chosen to try a new energy drink. Among them, 50 athletes were given the new energy drink and the remaining 50 athletes were given a placebo drink. The 50 athletes with the new energy drink reported having more energy while only 30 athletes given a placebo drink reported to have more energy. a. The energy drink gave the athletes more energy. ____________________ b. Overall, there is no significant difference in the energy level between the two groups. ____________________________

What does the following expression represent, where µ₁ is the symbol for the population mean for one group and µ₂ is the symbol for the population mean for the other group? H₁: µ₁ ≠ µ₂

Which symbol shows two-tailed hypothesis test?

Which of the following expressions indicates that there is a difference between two means being compared?