State whether each situation has independent or paired (depe…

State whether each situation has independent or paired (dependent) samples.  a) A researcher wants to know if the mean bumper repair cost for midsize cars is higher than the mean bumper repair cost for small cars. To test this, random samples of 23 midsize cars and 14 small cars were collected.These are samples. b) A researcher wants to know how big is the difference in muscle strength on the right and left hands of left-handed men. To test this, a random sample of 15 lefthanded men was collected and the difference in muscle strength (left hand- right hand) was found. These are samples.

Complete the paragraph with the present perfect or simple pa…

Complete the paragraph with the present perfect or simple past form of the verbs in parentheses. Adam Williams is a young Welsh soccer player who already (have) great success. He (join) his local soccer club, Tangwystl, when he was ten, and (become) their youngest player ever at the age of 14. At present, he (move) to one of the biggest soccer clubs in the world, where he (make) himself very popular with the fans because of his skill and effort. In his short career, Aaron already (play) for Wales on many occasions, and many experts feel that the Welsh national team (not / have) such a talented player for many years.

Choose the correct statement or question to complete each co…

Choose the correct statement or question to complete each conversation. Write the letter of the correct statement or question (a or b) in the space. 1.  A:  B: Yes, we do.a. Have we got to come to school tomorrow?b. Do we have to come to school tomorrow? 2. A: Why did you have to leave early?B: a. We have to leave early because of the rain.b. We had to leave early because of the rain.   3.  A: B: No, I’ll be home early.a. Do you shall work late tonight?b. Do you have to work late tonight?   4. A: Are you leaving right now? B: a. No, I don’t have to go yet.b. No, I haven’t got to go yet.