You are the manager of a fast food restaurant. You want to determine whether the waiting to place an order has changed in the last month from its previous population mean value of 4.5 minutes. From past experience, you can assume that the population standard deviation is 1.2 minutes. You select a sample of 25 orders during a one-hour period. The sample mean is 5.1 minutes. USE THE 6-STEP APPROACH in chapter 9 to determine whether there is evidence at the .05 level of significance that the mean waiting time is place an order has changed in the last month from its previous mean value of 4.5 minutes. (You must do all 6 steps to receive credit for this problem)

A). Heavy rains or fast-melting snow causes floods in many parts of the world.

Explanation:

Subject-verb agreement is demonstrated as the grammatical rule which implies the agreement of subject and verb in terms of number. It implies that a singular noun must correspond to a singular verb while a plural must correspond to a plural verb.

As per the question, option A implies a correct subject-verb agreement as it includes the subjects 'Heavy rains' and 'fast-melting snow' are linked by coordinating conjunction 'or' that turns it singular and therefore, the verb must also be 'singular'(causes). Thus, option A is the correct answer as in option B the subject and verb do not agree in number.