On average, who spends more money on Prom? Forty-two senior girls and thirty-nine senior boys were asked how much they plan on spending on prom this spring. 1 proportion z-test

2 proportion z-test

1 sample t-test

2 sample t-test

Paired t-test

1 proportion z-interval

2 proportion z-interval

1 sample t-interval

2 sample t-interval

Paired t-interval

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Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.