The sample mean and standard deviation from a random sample of 32 observations from a normal population were computed as x¯=26 and s=9. test whether there is enough evidence to infer at the 10% significance level that the population mean is greater than 23. find the critical region. (e. g. t > 1 for a one-tailed test, or t < -1 or t > 1 for a two-tailed test.)

There is enough evidence to infer at the 10% significance level that the population mean is greater than 23

Step-by-step explanation:

Given that the sample mean is 26 and sample std dev = 9

i.e

(Right tailed test at 10% significance level)

Mean diff = 3

Test statistic t =

Critical region is t>1.310

df 31

p value = 0.034

Since p <0.10 reject null hypothesis

There is enough evidence to infer at the 10% significance level that the population mean is greater than 23

Critical region is in the enclosed file

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

step-by-step explanation:

step-by-step explanation: