Datafile: Datafile_Question 1.xlsx  The file above contains a random sample of 200 service times during the busiest hour of the day at a particular fast-food restaurant. Calculate a 92% confidence interval for the proportion of service times longer than 90 seconds. What are the values of lower limit (LL) and upper limit (UL)? Round your answer to 3 decimal places.   

A manufacturer needs to buy aluminum sheets with an average thickness of 0.05 inch. The manufacturer knows that significantly thinner sheets would be unsafe and considerably thicker sheet would be too heavy. Perform a test to answer whether the manufacturer should buy aluminum sheets from this supplier. Data file: Data file for Hypothesis Testing.xlsx

Sara is going through relapse prevention as part of her cognitive behavior therapy. During this process, it is likely she will 

This hormone sends a signal to the brain indicating fullness.

A study is performed in a large southern town to determine whether the average amount spent on food per four-person family in the town is significantly different from the national average of $150. A random sample of the weekly grocery bills of two-person families in this town is given in the file below.  Data file: Hypothesis Testing_Data file.xlsx

Construct a 95% confidence interval to estimate mean Age. What are the values of lower limit (LL) and upper limit (UL)?  Data file: Data file – Question 3.xlsx

The following 3 questions are based on this case: Sarah, a 35-year-old woman, seeks therapy for her persistent anxiety and low self-esteem. She describes feeling constantly worried about making mistakes at work, which leads to difficulty concentrating and sleeping. Sarah often criticizes herself for perceived failures and finds it hard to accept compliments from others. She reports feeling overwhelmed by her responsibilities and has begun avoiding social interactions due to fear of judgment.

Construct a 95% confidence interval to estimate mean male Age. What are the values of lower limit (LL) and upper limit (UL)?  Data file: Data file – Question 3 (updated)-5.xlsx

What is an advantage of group therapy over individual therapy?

You play a game where the amount you win (or lose, if negative) can be $1,000, $100, $0, or -$2,000. Let X be the amount you win (or lose), and assume the distribution of X is the following: P(X = 1,000) = 0.2, P(X = 100) = 0.4, P(X = 0) = 0.25, and P(X = -2,000) = 0.15. X P(X) 1000 0.2 100 0.4 0 0.25 -2000 0.15 Match the answers for the following questions: