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Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation of $650. State your answer. (Tc 1.729) hen 410 VU colege students were surveyed, 155 said they owned their own car. Construct a 95% confidence interval for the proportion of JWU college students who say they own their own cars. State your answer. (Zc 1.96)
math   Statistics-And-Probability   
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币 ts populaton 시。 A :0.3780 (o 33106,0-42494)

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