Question

Suuea saeH 6102 O nd Keypad saeyd jeupap oM o1 anSue unok puno es s a a aneA a pu j0 z dais uep sasaes a oddns o1 aouapna y8noua auay s na010a e Supsa% 6E ueun auoui s uogexauue JOAe oyM suapsa jo aBeuaad a aun isai o sueM 1s8ajens jeod e ejep aun Suisn uogexauue pauone suappsai aun jo % punoj pue um a 0091 Jo aldes e yoo1 Apnis jeld vapuq Mau e jo uogexauue au Joj ued e pasodo.ud sey umo e jo Jokeuu auu

Is this a one-tailed test or Two?

Answer 1

Answer)

It is a one tailed test

And Right tailed

As more than means one tailed on right side

Ho : P = 0.39

Ha : P > 0.39

Everything depends on Ha, if Ha got > sign, then its right tailed (one tailed) and if it got (< sign than it is a left tailed (again one tailed) ) and if it got not equal to sign, then it is a two tailed test.

And alternate hypothesis can only take sign of <, > or not equal to.

Test statistics = (observed p - claimed p)/standard error

Standard error = √claimed p*(1-claimedp)/√n

Claimed p = 0.39

Observed p = 0.42

N = 1600

Test statistics = 2.46

Fromz table, p(z>2.46) = 0.0069

P-value = 0.0069

As the obtained p-value is less than the given significance of 0.1

We reject the null hypothesis

And we have enough evidence to support the claim