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(1) Find the critical value tc for the confidence level c equals =0. 98 and sample...

(1) Find the critical value tc for the confidence level c equals =0. 98 and sample size n equals = 15

(2) Find the critical value tc for the confidence level c=0.98 and sample size n=7

(3) Construct the indicated confidence interval for the population mean mu using the​ t-distribution. Assume the population is normally distributed.

c=0.990. overbar x=12.9 s=4.0 n=55

(4) Construct the indicated confidence interval for the population mean μ using the​ t-distribution. Assume the population is normally distributed. c=0.900 overbar x =12.4 s =0.71 n =13

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