An elementary school claims that the standard deviation in reading scores of its fourth grade students is less than 4.35. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed. OA. two-tailed OB. right-tailed OC. left-tailed C

Of interest is whether the percent of managers at High Tech Inc. that pay over $8 per day for lunch is the same as the percent of technicians. Sixty managers are surveyed and forty-six of them pay over $8 per day for lunch. One hundred forty-nine techniciansare surveyed and ninety-eight of them pay over $8 per day for lunch. The hypothesis test to use is????   independent group means, population standard deviations known   independent group means, population standard deviations unknown   matched or paired samples   two proportions

Exam 1 scores have a mean of 500and a standard deviation of 110​, while exam 2 scores have a mean of 20 and a standard deviation of 3. Assuming both types of scores have distributions that are unimodal and​ symmetric, which is more​ unusual: an exam 1 score of 790 or an exam 2 score of 28​?       A. The exam 2 score is more unusual.   B. The exam 1 score is more unusual.   C. They are the same.   D. It cannot be determined which exam score is more unusual

According to the College Board, scores on the math section of the SAT Reasoning college entrance test for the class of 2010 had a mean of 516 and a standard deviation of 116. Assume that they are roughly normal.One of the quartiles of the scores from the math section of the SAT Reasoning test is 438. The other quartile is _______.

2.38 Baggage fees: An airline charges the following baggage fees: $20 for the first bag and $40 for the second. Suppose 50% of passengers have no checked luggage, 33% have only one piece of checked luggage and 17% have two pieces. We suppose a negligible portion of people check more than two bags. a) The average baggage-related revenue per passenger is: $ (please round to the nearest cent) b) The standard deviation of baggage-related revenue is: $ (please round to the nearest cent) c) About how much revenue should the airline expect for a flight of 100 passengers? $ (please round to the nearest dollar)

3. A small business in Irvine that sells clothing makes roughly $35 per transaction. The CEOsuspects that the business has recently been making less than usual. 40 transactions are randomlysampled from recent transactions and the dollar amount of the transaction recorded. The samplehas a mean of $32.50 and standard deviation of $2.50. a. Set up the null and alternative hypothesis (using mathematical notation/numbers and interpretthem in context of the problem) b. Calculate the test statistic for the test from part a. c. Compute the p-value for the test (use R). Round to the nearest 3rd decimal place, 0.xxx.

1) a) In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $44 and standard deviation of $10.Find the margin of error at a 90% confidence level.Give your answer accurate to two decimal places. ______________ b)In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $33 and standard deviation of $7.Construct a confidence interval in the form estimate ± margin of errorestimate ± margin of error at a 95% confidence level. _____________ ± _____________ Give your answers to one decimal place.

A golf analyst claims that the standard deviation of the​ 18-hole scores for a golfer is less than 2.9 strokes. State H0 and Ha in words and in symbols. Then determine whether the hypothesis test for this claim is​ left-tailed, right-tailed, or​ two-tailed. Explain your reasoning.   State the null hypothesis in words and in symbols. Choose the correct answer below. A. The null hypothesis expressed in words​ is, "the standard deviation of the​ 18-hole scores for a golfer is at least 2.9 strokes." The null hypothesis is expressed symbolically​ as, "H0​: σ≥2.9​." B. The null hypothesis expressed in words​ is, "the standard deviation of the​ 18-hole scores for a golfer is not 2.9 strokes." The null hypothesis is expressed symbolically​ as, ​"H0​: σ≠2.9​." C. The null hypothesis expressed in words​ is, "the standard deviation of the​ 18-hole scores for a golfer is less than 2.9 strokes." The null hypothesis is expressed symbolically​ as, "H0​: σ<2.9​." D. The null hypothesis expressed in…

A sales manager believes that the mean number of days per year her company's sales representatives spend traveling is less than 50.   A test is made of ?0 ? = 7 ?????? ?1 ? < 50. The null hypothesis is not rejected.  State an appropriate conclusion.

An auditor, pressed for time and on a low budget, is concerned with account errors on customer credit. She takes a sample of 25 accounts, and finds the account error, on average, is $-23, with a standard deviation of $16. Is the claim of the manager that errors average only $-10 supported? In this case, the null hypothesis is what?