A previous random sample of 4000 U.S. citizens yielded 2250 who are in favor of gun control legislation. How many citizens would need to be sampled for a 99 confidence interval to estimate the true proportion within 3?
A) 1916 B) 1814 C) 1695 D) 1842
Question 2
A local consumer reporter wants to compare the average costs of grocery items purchased at three different supermarkets, A, B, and C.
Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket.
The results of the ANOVA test are summarized in the following table.
Source df Anova SS Mean Square F Value Pr > F
Supermkt 2 2.6412678 1.3206399 39.23 0.0001
Item 59 215.5949311 3.6541514 108.54 0.0001
Error 118 3.9725322 0.0336655
Corrected Total 179 222.2087311
What is the value of the test statistic for determining whether the three supermarkets have the same average prices?
A) 108.54 B) 0.0001 C) 39.23 D) 1.3206
The control of breathing via respiratory centres in the mammalian brain.
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