This is Statistics. Answer what is required. Provide clean and clear Solutions

1. What is the critical value/s of a= 0.05 in a two tailed test? A.+ 1.95 B+ 1.96 C. $1.97 D. +1.98 2. What is the critical value of 0.01 level of significance when the alternative hypothesis indicates ? A. 2.575 B. 2.675 C. 2.775 D. 2.875 3. The average test score of entire school is 78 with standard deviation 10. A teacher took a random sample of 10 students and scored 75? What is the parameter mean? A. 8 B. 10 C. 75 D.78 4. The average test score for entire school is 78. The standard deviation of a random sample of 12 students is 10 with an average test score of 80. What is the sample mean? A. 10 B. 12 C. 78 D. 80