1. z - Test hypothesis test Suppose it is known that scores on a standardized test of reading comprehension for fourth graders is normally distributed with =70 and =10. A researcher wants to know if a new reading technique has an effect on comprehension. A random sample of n=25 fourth graders are taught the technique and then tested for reading comprehension. A sample mean, =75 is obtained. Does the sample mean differ enough from the population mean to conclude that the reading technique made a difference in the level of comprehension? Use five steps of hypothesis testing to answer the question.

2. One Sample t - Test hypothesis test Test whether artificial sunlight during the winter months affects one's depression. Without the light, a depression test has =8. With the light, our sample with n=41 produced a sample mean, =6. The test statistic is calculated and t= - 1.83. Use five steps of hypothesis testing to answer the question.