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Explanation & Answer
sin theta (costheta -4) = 0
sintheta =0 or costheta -4 =0
theta = 0, pi
costheta = 4 does not have solution
so the solution is 0 and pi in [0, 2pi)
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the population proportion of students who own their cars.
7) A survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone. Find a point
estimate for p, the population proportion of non-fatal accidents that involved the use of a cell phone. 8) A survey of 250 homeless persons showed that 17 were veterans. Find a point estimate p, for the
population proportion of homeless persons who are veterans. 9) Construct a 95% confidence interval for the population standard deviation σ of a random sample of
15 men who have a mean weight of 165.2 pounds with a standard deviation of 13.5 pounds. Assume the
population is normally distributed.
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mean of μ = 2.4. 12) A random sample of 120 students has a test score average with a standard deviation of 9.2. Find the
margin of error if c = 0.98
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