Question II

For example, a$,$ b$,$ c$,$ d show $4$ types of food products, each of which is known to be close to normal and has identical variance. From each food product a different random sample was taken, product a was taken $8$ samples, product b was taken $8$ samples, product $c$ was taken $6$ samples and product $d$ were taken $9$ samples

A B C D

$71687562$

$75717059$

$69748171$

$77667368$

$61697863$

$72677265$

$7170,72$

$7862,60$

$64$

Test with $=5\%,$ is there a significant difference between the averages of the four types of food products?