(2 points) Which of the following represents a two-tailed hypothesis test?

(2 points) Which of the following best describes a null hypothesis (H0) in the context of hypothesis testing?

The scores on a standardized test are normally distributed with a mean of 500 and a standard deviation of 100. 1.  A student scores 650 on the test. What is their z-score?2.  Another student has a z-score of -1.5. What is their actual test score?3.  Explain what the z-score tells you about a student’s performance relative to the rest of the group.  

(2 points) A researcher wants to test whether three different blood types are equally distributed in a population. Which test should be used?

(2 points) What is the significance level (alpha) used for in hypothesis testing?

(2 points) Which type of variable is defined by the ability to rank order its values?

(2 points) In the regression equation y = a + bx, what does the slope (b) represent?

(2 points) A teacher records the test scores of 100 students ranging from 35 to 98. Instead of listing each individual score, the teacher groups them into intervals such as 30-40, 41-50, and so on. What is the primary reason for grouping the data this way?

(2 points) During a community health survey, a researcher organizes participant ages into intervals and calculates both cumulative frequency and cumulative relative frequency. What is the key benefit of using cumulative relative frequency over just cumulative frequency?

(2 points) The use of dummy variables in statistical analysis allows for: