The nj department of highways wants to estimate the average number of the passenger cars that pass a busy intersection of r1 each day. the requirements are that the estimate be within t.10 cars per day of the population mean and that the investigators be 99% confident of the results. a similar study showed that the standard deviation to be 50 cars per day. how large a sample is required? a) 13 b) 67 c) 52 d) 161 e) 167

The sample size should be approximately 167.

Step-by-step explanation:

We are given the following in the question

Sample size, n = 10

Confidence level = 99%

Significance level = 0.01

Standard deviation, σ = 50

Error = 10

Formula:

Ptting values, we get,

The sample size should be approximately 167.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

d) 48

step-by-step explanation:

16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,256,272,288,304,320,336