HELP ON MY HOMEWORK

In a random sample of 7 cell phones, the mean full retail price was $547.40 and the standard deviation was $184.00. Further research suggests that the population mean is $429.07. Does the t-value for the original sample fall between - to.99 and to.99? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t= fall between - to.99 and to.99 because to.99 = (Round to two decima d.) does does notConstruct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. C= 0.98, x = 12.3, s = 0.74, n= 12 (Round to one decimal place as needed.)