A manager wanted to know if the level of depression among his company's employees differed from the normal level (100).

[answerhappygod]

A manager wanted to know if the level of depression among his company's employees differed from the normal level (100). According to the depression scale, ten participants were randomly selected and asked to apply this scale. The employee depression scores were as follows:
90, 110, 120, 80, 110, 105, 95, 85, 100, 90
Required achievements:
1- Statistical formulation of null and alternative hypotheses
2- The computed and critical t-values at the 0.05 level of significance.
3- Decision in the null hypothesis (rejection or non-rejection).
4- Entering the same data into the SPSS program and comparing it with the calculated results.