$2.$ A batsman struggling with his form was advised to take training sessions from batting coach

Ramakant Achrekar, who had in the past trained Sachin Tendulkar. The batting scores of the batsman

before the coaching and after the coaching are recorded as follows,

Before

$35$

$38$

$40$

$28$

$32$

$35$

$39$

$45$

$42$

$37$

After

$45$

$42$

$40$

$47$

$50$

$43$

$35$

$36$

$40$

$45$

At $5\%$ level of significance do you think that the coaching has been effective? Give reasons for your

answer.