In each part, give the value of the standardized statistic (z-score) for the sample proportion. (Round your answers to three decimal places.) (a) = 0.56, p = 0.60, n = 150 Z = (b) = 0.91, p = 0.90, n = 900 z = (c) p = 0.26, p = 0.50, n = 500 Z =

PROPORTIONS Sample Size: Calculate the sample size. A previous study showed that 69% of community college students have read a book for personal enjoyment during the school year. If a new study were to be done in order to reduce the margin of error to 1%, how many students should be sampled?

Find the test statistic for a proportion "p" given the following information. Malloree ordered 15 pair of shoes online during the stay-at-home order, and 2 pairs arrived with mismatched sizes. Looking on line, she found that the retailer claimed that this happened 4% of the time with online orders. Enter your answer rounded to the thousandths place.

Solve 3 and 4

The 95% interval for a statistics test was given by 55 + 7. What is the lower value for the interval? O a. 62 O b. 48 O c. 55 O d. 7

Winston has just gone grocery shopping. The mean cost for each item in his bag was $3.48. He bought a total of 9 items, and the prices of 8 of those items are listed below: $2.75,$4.06,$3.16,$3.92,$4.29,$2.77,$3.01,$4.57 Determine the price of the 9th item in his bag.

Which z-score has the higher frequency? (a) z = +1.0 or z = +2.3; (b) z = −2.8 or z = −1.7; (c) z = −.70 or z = −.20; (d) z = 0.0 or z = −2.0.

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Test whether males are less likely than females to support a ballot initiative, if 23% of a random sample of 50 males plan to vote yes on the initiative and 32% of a random sample of 50 females plan to vote yes.

Nationally 58.3% of federal prisoners are serving time for drug offenses. A warden feels that in his prison the percentage is even higher. He surveys 350 randomly selected inmates’ records and finds that 260 of the inmates are drug offenders. At
= 0.05, is he correct?