91影视

"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 $70$ 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.

Step by step solution

01

Given information

Names of the Japanese girls are given. $70\%$of traditional mothers named their daughter's name ending with "KO"

02

Explanation

State the hypothesis:

The null hypothesis states that more than $70\%$of the old generation in Japan would have names ending with "KO" and the alternate hypothesis states that less than $70\%$of old generation in Japan would have names ending with "KO".

$$\begin{gathered} H_0:p鈮�0.70 \\ {H}_0:p<0.70 \end{gathered}$$

The normal distribution is:

$N\left(0.70,\sqrt{\frac{\left(0.70\right)\left(0.30\right)}{9}}\right)$

The Z test statistic is calculated as:

$z=\frac{p^{鈭�}-p}{\sqrt{{\displaystyle \frac{p\left(1-p\right)}{n}}}}$

Where n is the sample size of $9$respondents:

$$\begin{gathered} P^{鈭�}=\frac{x}{n} \\ =\frac{2}{9} \\ =0.22 \end{gathered}$$

Substitute the $P^{鈭�}$value in theZ test statistic

$$\begin{gathered} z=\frac{p^{鈭�}-p}{\sqrt{{\displaystyle \frac{p\left(1-p\right)}{n}}}} \\ =\frac{0.22-0.70}{\sqrt{{\displaystyle \frac{p\left(1-p\right)}{n}}}} \\ =\frac{-0.47}{0.153} \\ =-3.077 \end{gathered}$$

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