Question 7 (4 points) The monthly advertising expenditure of a hardware store is normally distributed with a standard deviation of $100. If a sample of 10 randomly selected months yields a mean monthly advertising expenditure of $380, what is the lower limit of the 95% confidence interval for the store's mean monthly advertising expenditure? Q about $318.0 0 about $298.5 0 about $339.5 0 about $328.0 Set up the hypotheses for the following situations. Question 8 (2 points) A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink. Any over filling or under filling results in the shutdown and readjustment of the machine. To determine whether the machine is properly adjusted, the correct set of hypotheses is OHo: MS 12 Ha: M > 12 Ho: M $ 12 Hai M = 12 OHo: M = 12 Hai M # 12 OHo: M 2 12 Hai M 40,000 Ha: u 5 40,000 0 H0: u 40,000 Question 10 (2 points) The average monthly rent for one-bedroom apartments in Florence has been $700. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rent. The set of hypotheses to be tested is __________ . O HO: u z 700 Ha: u 700 Ha: u s 700 O HO: us 700 Ha: u> 700