How do you know when a hypothesis test is left-tailed, right-tailed or two-tailed? How is this related to the alternative hypothesis?

Abigail, who works for a region's department of health, is looking for evidence that the percentage of adults in the region who are current smokers has decreased from 15.8% in 2015, She gathers a random sample of adults in the region and asks each individual if he or she currently smokes. Abigail found that 40 of the 277 adults who were surveyed are current smokers. What are the null and alternative hypotheses for this hypothesis test? Select the correct answer below: O Ho: p0.158 Ha : p=0.158 0 Ho : p= 0.158 Ha: p> 0.158 Ho : p: 0.158 Ha p0.158 10 ĺHo:p=0.158 Ha: p0.158

how do you do a two-tailed test with a= .05. with the four steps for hypothesis testing and labeling each step 1,2,3,4? Also, what is it? (maybe a real-life example).

A dentist hypothesizes that the average time a child spends brushing their teeth is less than 60% of the suggested time brushing their teeth in the morning. The appropriate hypothesis test is a left tailed test for a population mean. false true

Consider the following data: - 4 - 3 - 1 P(X = x) 0.2 0.1 0.2 0.1 0.4 Step 4 of 5: Find the value of P(X > -2). Round your answer to one decimal place.

What is the difference between the null hypothesis and the alternative hypothesis when doing a hypothesis test?

What is the formula for a two tailed test?

Under what research situation would a researcher use a one-tailed test rather than a two-tailed test?

Recognize when to use a hypothesis test?

Suppose you are asked to conduct a two-tailed hypothesis test on the population mean. What type of hypothesis test would you use? Why? What assumptions do you need to make about the process when you are conducting a hypothesis test on the population mean in order for your results to be valid?