Researchers control factors such as age or attitudes that might influence a dependent variable by means of: a) operational definitions. b) naturalistic observation. c) replication. d) random assignment.

Gideon company uses the allowance method of accounting for uncollectible accounts. on may 3, the gideon company wrote off the $2,200 uncollectible account of its customer, a. hopkins. on july 10, gideon received a check for the full amount of $2,200 from hopkins. the entry or entries gideon makes to record the write off of the account on may 3 is:

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Sales at a fast-food restaurant average $6,000 per day. the restaurant decided to introduce an advertising campaign to increase daily sales. to determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. they found that the average daily sales were $6,300 per day. from past history, the restaurant knew that its population standard deviation is about $1,000. if the level of significance is 0.01, have sales increased as a result of the advertising campaign? multiple choicea)fail to reject the null hypothesis.b)reject the null hypothesis and conclude the mean is higher than $6,000 per day.c)reject the null hypothesis and conclude the mean is lower than $6,000 per day.d)reject the null hypothesis and conclude that the mean is equal to $6,000 per day.expert answer