Topic
Q:
Аисперсия ряда чисел 4,\( 1 ; 8,7 ;-15,1 ;-21,2 \) составляет 157,971875 . чему будет равна дислерсия, если все
числа увеличить на 17 ?
Ответ:
Q:
22 Determina quale fra \( A, B \) e \( C \) è la misura meno precisa, se
l'errore relativo di \( A \) è 0,0125 , l'errore relativo di \( B \) è 0,025 ,
mentre quello di \( C \) è 0,08 .
Q:
In un giornale del 2021 si legge: «Le vendite di automobili nel primo semestre del 2020
sono diminuite del 15,4\% rispetto al 2019 e nel secondo semestre sono calate dell' \( 8,3 \% \)
rispetto al primo semestre. La previsione per il 2021 è di un aumento dell'1,5\%\%.
a. Qual è la percentuale di calo nel 2020 ?
b. Nel 2019 sono state vendute 1750420 auto. Quante ne sono state vendute nel 2020?
c. Quante auto si prevede approssimativamente di vendere nel 2021?
Q:
21 Determina quale fra \( A \) e \( B \) è la misura più precisa, sapen
che l'errore relativo di \( A \) è 0,0045 e quello di \( B \) è 0,045 .
Q:
Найди дисперсию числового ряда \( 4 ; 9 ;-5 ;-18 \).
Заполни пропуски, во всех ячейках округление выполняй до сотых.
1. Среднее арифметическое ряда: \( \frac{(4+9+(-5)+(-18))}{4}=\square \)
2. Квадрат отклонения каждого числа:
\( (4-(-2,5))^{2}=42,25 \);
\( (9-(-2,5))^{2}=\square \)
\( (-5-(-2,5))^{2}=\square \)
\( (-18-(-2,5))^{2}=240,25 \).
3. дисперсия: \( \frac{(42,25+132,25+6,25+240,25)}{4}=\square \)
Q:
ผลการวิเคราะห์ปริมาณตะกัวในเลือดโดยการทดลองซำ 5 ครั้ง ได้ค่าเฉลี่ย
\( 11.8 \mathrm{mg} / \mathrm{L} \) และมีค่าเบี่ยงเบนมาตรฐานเป็น \( \pm 0.7 \) เมื่อนำตัวอย่างเลือด
มาตรฐาน \( C R M \) ระบุปริมาณตะกั่วเท่ากับ \( 10.9 \mathrm{mg} / \mathrm{L} \) มาทำการวิเคราะห์
โดยวิธีเดียวกัน
จงแสดงว่าผลการวิเคราะห์ (ค่าเฉลี่ย) แตกต่างอย่างมีนัยสำคัญจากค่าจริง
หรือไม่ ที่ระดับความเชื่อมั่น \( 95 \% \)
Q:
A researcher wishes to compare the proportion of marijuana usage among students using usage categories low,
medium, and high. She wants to determine if usage is related to parents' income, using categories low, medium, and
high. She will analyze this data using
the chi-square test.
the two-sample procedures for proportions.
the two-sample \( t \) test procedure.
ANOVA.
Q:
5 Resultatet av en undersökning visas i två
cirkeldiagram. Cirklarnas area är proportionell
mot antalet elever. I undersökningen svarade
351 tjejer och killar ja.
a) Hur många elever deltog i undersökningen?
b) Hur många killar svarade nej?
Q:
The weights for newborn babies is approximately normally distributed with a mean of 5.1 pounds and a
standard deviation of 1.1 pounds.
Consider a group of 1300 newborn babies:
1. How many would you expect to weigh between 4 and 9 pounds?
2. How many would you expect to weigh less than 8 pounds?
3. How many would you expect to weigh more than 6 pounds?
4. How many would you expect to weigh between 5.1 and 10 pounds?
Q:
\begin{tabular}{l}\( \mid \) Which \( r \)-value implies the stronger linear relationship? Select one. \\ \( \square r=0 \) \\ \( \square r=-0.5 \) \\ \( \square r=-0.3 \) \\ \( \square r=-0.4 \) \\ \( \square r=-0.9 \) \\ \( \square r \) Question Help: \( \square \) Video \\ Submit Question \\ \hline\end{tabular}
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