The activation temperature (in â¦F) of a sprinkler system, Y , is normally distributed with population mean µ and population variance Ï 2 = 52 . A random sample of n = 10 sprinklers is obtained and the activation temperature is recorded for each sprinkler. The sample mean is Y = 120. Required:
a. Calculate a 95% confidence interval for µ.
b. What is the standard error of the sample mean?
c. What is the margin of error of the confidence interval in (a)?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6

The students in a class were asked how many siblings they have. the data obtained is represented in the dot plot. the number of students who have no siblings is . the number of students who have three or more siblings is .