A researcher wants to know if calcium is an effective treatment for lowering blood pressure. He assigns one randomly chosen group of volunteers to take calcium supplements; the other group will get placebo. At the end of the treatment period, he measures the difference in blood pressure. The 50 members of the calcium group had blood pressure lowered by an average of 25 points with a standard deviation of 10 points. The 50 members of the placebo group had blood pressure lowered by an average of 15 points with a standard deviation of 8 points. To analyze this information we will use a

Two sample t procedure

Step-by-step explanation:

The two sample t test is used when want to test for equality between two population means. It tests whether the means of the two groups are equal or not equal.

We use this to analyse this information in this question because we do not have data available for the population standard deviation. Also we are to test for the significant difference between the two different groups of participants

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: