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Chapter 9: Q.54 (page 539)
A bottle of water is labeled as containing 16 fluid ounces of water. You believe it is less than that. What type of test would you use?
A left-tailed test will be used.
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According to the N.Y. Times Almanac the mean family size in the U.S. is . A sample of a college math class resulted in the following family sizes:
At level, is the class鈥� mean family size greater than the national average? Does the Almanac result remain valid? Why?
"Japanese Girls鈥� Names"
by Kumi Furuichi
It used to be very typical for Japanese girls鈥� names to end with 鈥渒o.鈥� (The trend might have started around my grandmothers鈥� generation and its peak might have been around my mother鈥檚 generation.) 鈥淜o鈥� means 鈥渃hild鈥� in Chinese characters. Parents would name their daughters with 鈥渒o鈥� attaching to other Chinese characters which have meanings that they want their daughters to become, such as Sachiko鈥攈appy child, Yoshiko鈥攁 good child, Yasuko鈥攁 healthy child, and so on. However, I noticed recently that only two out of nine of my Japanese girlfriends at this school have names which end with 鈥渒o.鈥� More and more, parents seem to have become creative, modernized, and, sometimes, westernized in naming their children.
I have a feeling that, while percent or more of my mother鈥檚 generation would have names with 鈥渒o鈥� at the end, the proportion has dropped among my peers. I wrote down all my Japanese friends鈥�, ex-classmates鈥�, co-workers, and acquaintances鈥� names that I could remember. Following are the names. (Some are repeats.) Test to see if the proportion has dropped for this generation.
Ai, Akemi, Akiko, Ayumi, Chiaki, Chie, Eiko, Eri, Eriko, Fumiko, Harumi, Hitomi, Hiroko, Hiroko, Hidemi, Hisako, Hinako, Izumi, Izumi, Junko, Junko, Kana, Kanako, Kanayo, Kayo, Kayoko, Kazumi, Keiko, Keiko, Kei, Kumi, Kumiko, Kyoko, Kyoko, Madoka, Maho, Mai, Maiko, Maki, Miki, Miki, Mikiko, Mina, Minako, Miyako, Momoko, Nana, Naoko, Naoko, Naoko, Noriko, Rieko, Rika, Rika, Rumiko, Rei, Reiko, Reiko, Sachiko, Sachiko, Sachiyo, Saki, Sayaka, Sayoko, Sayuri, Seiko, Shiho, Shizuka, Sumiko, Takako, Takako, Tomoe, Tomoe, Tomoko, Touko, Yasuko, Yasuko, Yasuyo, Yoko, Yoko, Yoko, Yoshiko, Yoshiko, Yoshiko, Yuka, Yuki, Yuki, Yukiko, Yuko, Yuko.
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. She surveys 84 of her students and finds that 11 of them attended the midnight showing. At a 1% level of significance, an appropriate conclusion is:
a. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than 20%.
b. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is more than 20%.
c. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than 20%.
d. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is at least 20%.
On a state driver's test, about pass the test on the first try. We want to test if more than pass on the first try. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
A Nissan Motor Corporation advertisement read, 鈥淭he average man鈥檚 I.Q. is The average brown trout鈥檚 . So why can鈥檛 man catch brown trout?鈥� Suppose you believe that the brown trout鈥檚 mean I.Q. is greater than four. You catch brown trout. A fish psychologist determines the I.Q.s as follows: . Conduct a hypothesis test of your belief.
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