Dabur wants to conduct a nationwide quantitative study to map the usage of almond oil. However, the variability is unknown to the manager, who wishes to calculate the sample size that she might need to conduct the research. She wants a confidence level of 95% with a precision (allowable error) of 65%. Determine the sample size using the formula in the text, and arrive at a figure that the manager could use in this case, where the variability is unknown.