Using what\'s given, do one of the following: Enter the critical value z, enter

Question

Using what's given, do one of the following: Enter the critical value z, enter the critical value t, or if neither the normal nor the t-distribution applies, enter 0. Use values from the appropriate table.

95% confidence; n = 12; is unknown, population appears to be normally distributed

99% confidence; n = 18; is known, population appears to be normally distributed

95% confidence; n = 10; is known, population appears to be very skewed

90% confidence; n = 46; is unknown, population appears to be normally distributed

98% confidence; n = 52; is known, population appears to be very skewed

Explanation / Answer

a) is unknown , we will use t distribution

tcrit = t0.025,11 = 2.201

b) is known , we will use z distribution

Zcrit = Z0.005 = 2.575

c) 0. Because population is not normal and n is very small

d) tcrit = t0.05,45 = 1.679

e) Since, n is large so we will use z distribution, according to central limit theorem

Zcrit = Z0.01 = 2.33

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