Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least… 1 answer below »

Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that

at least 70% of investors are currently confident of meeting their investment objectives.

A UBS Investor Optimism Survey, conducted over the period January 2 to January 15,found that 67% of investors were confident of meeting their investment objectives (CNBC,

January 20, 2006).

a. Formulate the hypotheses that can be used to test the validity of the brokerage firm

executive’s claim.

b. Assume the UBS Investor Optimism Survey collected information from 300 investors.

What is the p-value for the hypothesis test?

c. At a .05, should the executive’s claim be rejected?

 

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