PLEASE HELP ME I REALLY NEED HELP!! Phil bought 700 shares of a company's stock for $9.29/share. He pays a broker a commission of $18 to buy and sell stock. After one
year, he sold all his shares, which were worth $9.90/share at that time.
What was his rate of return?
6.0%
6.2%
6.5%
6.8%

Astudy claims that the mean age of online dating service users is 40 years. some researchers think this is not accurate and want to show that the mean age is not 40 years. identify the null hypothesis, h0, and the alternative hypothesis, ha, in terms of the parameter μ. select the correct answer below: h0: μ≥40; ha: μ< 40 h0: μ≤40; ha: μ> 40 h0: μ≠40; ha: μ=40 h0: μ=40; ha: μ≠40