Query : Why did value t4 at 5% is negative ? This is left tailed test and this should be positive. Or evertime when we see values of normal and t distribution would be in +- form(+-2.132) due to both these are symmetrical. Please clarify
Are u talking about the value of t4 or test statistics. Since it is left tailed test, obviously we will compare the test statistics value with lower 5% ( which is negative). For left tailed-we need to see whether the test statistics is greater than the lower 5% value and for right tail- we need to see whether it is less than upper 5%. Since it should lie in the (-2.132,+2.132) interval for the null hypothesis to be accepted.
