A clinical trial was conducted to test the effectiveness of a drug for reducing the wake time of insomnia patients. After treatment, the 16 sample subjects had a mean wake time of 93.3 minutes and a standard deviation of 43.8 minutes. Construct a 99% confidence interval estimate of the mean wake time for all patients after being treated with this drug

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

How many lines can be drawn through points j and k? 0 1 2 3

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)