Please answer the following questions. Make sure to cite if you use any other so

Please answer the following questions. Make sure to cite if you use any other sources. Grammar and spelling errors make comments distracting.
1. Are t-tests or Z-tests used more often in business research? Why?
2. A manufacturer of disposable washcloths/wipes told a retailer that sales for this product category closely correlated with sales of disposable diapers. The retailer thought he would check this out for his own sales-forecasting purposes. The researcher says, “Disposable washcloths/wipes sales can be predicted with knowledge of disposable diaper sales.” Is this the right thing to say?
To answer question #3 please see the attachment.
3. Describe an alternative approach to the analysis of the original data. Which of these two analyses
would you suggest using it?