1.Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 92 were delivered within the promised time. At the 0.05 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?

2.The policy of the Suburban Transit Authority is to add a bus route if more than 55% of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. Does the Bowman-to-downtown route meet the STA criterion? Use the .05 significance level.

3.Each month the National Association of Purchasing Managers surveys purchasing managers and publishes the NAPM index. One of the questions asked on the survey is: Do you think the economy is contracting? Last month, of the 300 responding managers, 160 answered yes to the question. This month, 170 of the 290 managers indicated they felt the economy was contracting. At the .05 significance level, can we conclude that a larger proportion of the purchasing managers believe the economy is contracting this month?

4.The National Basketball Association had 39 African-American top executives (presidents or vice presidents) among its 388 senior managers. Meanwhile, Major League Baseball had only 11 African Americans among its 307 top administrators. Test at the .05 significance level if this reveals the NBA has significantly more African-American participation in higher levels of management.