, 13.06.2021 07:30 MarishaTucker

# An advertiser was about to launch an advertisement campaign for a new product. He conducted a random survey to find the preference for the new product among the respondents. Based on his previous experience, he found the standard deviation for the population as 4. Because the population mean was not known to him, he randomly selected 25 responses and found that the sample mean preference for the new product was 10. Which of the following parameters did he use to calculate a confidence interval at the 95% confidence level for this population mean? ​

### Another question on SAT

SAT, 23.06.2019 02:30
The semicircle shown at left has center xxx and diameter \overline{wz} ​wz ​ ​​ start overline, w, z, end overline. the radius \overline{xy} ​xy ​ ​​ start overline, x, y, end overline of the semicircle has length 222. the chord \overline{yz} ​yz ​ ​​ start overline, y, z, end overline has length 222. what is the area of the shaded sector formed by obtuse angle wxywxyw, x, y?
SAT, 24.06.2019 07:10
Vera is on her school's track and field team. in a practice long-jump competition against her teammates, she gets 5 points for landing over the farther line. she gets a total of 7 jumps and lands x times over the farther line and the rest of the times over the closer line. which of the following functions represents vera's total score? a. f(x)=10x b. f(x)=5x+35 c. f(x)=10x+5 d. f(x)=70-5x