1. z – Test hypothesis test Suppose it is known that scores on a…1. z – Test hypothesis test Suppose it is known that scores on a standardized test of reading comprehension for fourthgraders is normally distributed with ?=70 and ?=10. A researcher wants to know if a new readingtechnique has an effect on comprehension. A random sample of n=25 fourth graders are taughtthe 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 readingtechnique 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 thelight, 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. MathStatistics and Probability PSYC MISC
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