ormulate the null and alternative hypotheses. Identify whether it is one-tailed or two tailed. If the hypothesis is one-tailed, identify its direction whether left or right. Write your answer on a separate sheet of paper. Note: You need to provide 3 answers (null hypothesis, alternative hypothesis, and ___-tailed test) for each question.

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Activity1: Formulate the null and alternative hypotheses. Identify whether it is one-tailed or two tailed. If the hypothesis is one-tailed, identify its direction whether left or right. Write your answer on a separate sheet of paper. Note: You need to provide 3 answers (null hypothesis, alternative hypothesis, and ___-tailed test) for each question.
7. A recent survey says that Filipino children spend an average of 4hr a day playing computer
games with standard deviation of 30min. A random sarnple of 9 children is taken from a normally
distributed population of children who spend an average of 3.5hr playing computer games.
Using the 1% level of significance, would you conclude that the statement in the survey is
correct?
8. A workout program states that there is an average weight loss of 12 pounds (lb) for those who
enrol in the program for two months. Another work out program advertises greater weight loss
and was tested with a group of 30 volunteers who averaged 13lb weight loss after two months,
with standard variation of 2.5lb. Does the second workout program offer a higher average weight
loss effect? Test the hypothesis at a significance level of 5%.
9. It is assumed that the mean IQ is 100. In a study conducted by a researcher, a sample of 16
people had an average of 90 with standard deviation of 15. Is the group significantly different
from the regular population? Use a = 0.10.
10. A researcher wants to determine if review sessions affect the performance of students in exams.
A review session is administered to a sample of 25 students and after the examination, a sample
mean of 43 is calculated with a standard deviation of 8. From previous examinations, it was
identified that the population mean for the same exam is 40. Can the professor conclude that
the review session is effective in improving exam performance?
Transcribed Image Text:7. A recent survey says that Filipino children spend an average of 4hr a day playing computer games with standard deviation of 30min. A random sarnple of 9 children is taken from a normally distributed population of children who spend an average of 3.5hr playing computer games. Using the 1% level of significance, would you conclude that the statement in the survey is correct? 8. A workout program states that there is an average weight loss of 12 pounds (lb) for those who enrol in the program for two months. Another work out program advertises greater weight loss and was tested with a group of 30 volunteers who averaged 13lb weight loss after two months, with standard variation of 2.5lb. Does the second workout program offer a higher average weight loss effect? Test the hypothesis at a significance level of 5%. 9. It is assumed that the mean IQ is 100. In a study conducted by a researcher, a sample of 16 people had an average of 90 with standard deviation of 15. Is the group significantly different from the regular population? Use a = 0.10. 10. A researcher wants to determine if review sessions affect the performance of students in exams. A review session is administered to a sample of 25 students and after the examination, a sample mean of 43 is calculated with a standard deviation of 8. From previous examinations, it was identified that the population mean for the same exam is 40. Can the professor conclude that the review session is effective in improving exam performance?
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