4. Thirty-six educational software titles were randomly picked from a catalog. The mean cost was $31.14 with a standard deviation of $4.69. Thirty-nine entertainment software titles were randomly picked from the same catalog. The mean cost was $33.86 with a standard deviation of $10.87. Decide whether children's educational software costs less, on average, than children's entertainment software. Test at 10% Level of significance. 15 marks estimation at 5% level of significance? 5. Use the same data given in the above question and find the interval 15 marks