# qmet 252 essay

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A producer wants to boost the shelf life of the line of wedding cake mixes. Previous records show that the normal shelf life from the mix is usually 216 times. After a revised mix has become developed, an example of nine boxes of cake combine gave these types of shelf lives (in days): 215, 217, 218, 219, 216, 217, 217, 218 and 218. At the 0. 025 level, has the life of the dessert mix increased? Choose one solution. ||a. Simply no, because calculated t lies in the region of acceptance. | | ||b. Yes, mainly because computed t is less than the critical benefit. | | ||c.

Certainly, because computed t is greater than the critical worth. | | ||d. Simply no, because 217. 24 is fairly close to 216. | | Population normal deviation not known, we need to use t test out. Using info analysis, we could get the sample mean 217. 222 and sample common deviation 1 ) 202. Ho: u 216 Reject Ho if t &gt, 2 . 306 (one-tailed test having a = zero. 025 and df sama dengan 8) big t = (217. 222 ” 216) as well as (1. 202/sqrt(9)) = several. 05 Reject Ho. The shelf life of the cake blend has increased. Accurate Marks with this submission: 2/2.

Question 2 Marks: you If? sama dengan 0. 05 for a two-tailed test, how large is the acknowledgement area? Choose one answer. ||a. 0. 025 | | ||b. 0. 975 | | ||c. 0. 05 | | ||d. 0. 95 | | Inappropriate Marks just for this submission: 0/1. Question a few Marks: you A random sample of size 12-15 is selected from a regular population. The population standard change is unfamiliar. Assume that a two-tailed test out at the 0. 10 relevance level is to be used. So that value of t does the null speculation not always be rejected? Select one answer. ||a. To the left of -1. 345 or to the ideal of 1. forty-five | | ||b. To the left of -1. 645 in order to the right of just one. 645 | | ||c. To the left of -1. 282 or to the right of 1. 282 | | ||d. Between -1. 761 and 1 . 761 | | n=15 =&gt, df = 15-1=14 a sama dengan 0. 10 (two-tailed test) Decision secret: rejection Ho if determined t &gt, 1 . 761 or t &lt, -1. 761, or in other words, we can not reject the null hypothesis if the worth of capital t falls among -1. 761 and 1 ) 761. Appropriate Marks just for this submission: 1/1. Question four

Marks: a couple of A producer of music equipment introduces new types in the fall. Retail sellers are surveyed immediately after the Christmas offering season relating to their share on hand of every piece of equipment. It is discovered that until 40% of the new gear ordered by the retailers in the fall had been sold simply by Christmas, immediate production cuts are required. The manufacturer has found that getting in touch with all of the sellers after Christmas by email is annoying as many of these never respond. This year eighty dealers had been selected randomly and telephoned regarding a fresh receiver.

It was discovered that 38% of those receivers had been distributed. Since 38% is less than forty percent, does this imply that immediate production cutbacks will be needed or perhaps can this difference of two percentage items be attributed to sampling? Evaluation at the 0. 05 level. Choose one answer. ||a. Cut back production | | ||b. Cannot decide based on information given | | ||c. non-e of such | | ||d. Do not cut back development | |

It is a tests concerning proportions. Ho:? &gt, = 0. 4 H1:? &lt, 0. 4 (reflection of the inquiry ” instant production cutbacks are necessary if below 40% in the new gear ordered by the retailers in the fall have been sold simply by Christmas). Decision rule: reject Ho in the event z &lt, -1. sixty five Z sama dengan (0. 35 ” 0. 4)/sqrt(0. 4*(1-0. 4)/80) sama dengan -0. 37 Do not decline Ho. The maker will not lessen production. Accurate Marks in this submission: 2/2. Question 5 Marks: one particular A equipment is set to fill the small size plans of MILLIMETER candies with 56 goodies per handbag. A sample revealed: 3 luggage of 56, 2 bags of 57, 1 bag of fifty five, and two bags of 58.

Just how many degrees of freedom are available? Choose one answer. ||a. six | | ||b. on the lookout for | | ||c. six | | ||d. almost eight | | ||e. one particular | | Total number of luggage = 3+2+1+2=8 df = 8-1=7 Wrong Marks with this submission: 0/1. Question 6th Marks: 1 What benefit does the null hypothesis make a claim about? Select one answer. ||a. Population parameter | | ||b. Sample mean | | ||c. Sample statistic | | ||d. Type II error | | Correct

Markings for this submitting: 1/1. Problem 7 Signifies: 1 In the event that? = 0. 05, precisely what is the likelihood of making a Type I mistake? Choose one response. ||a. 20/20 | | ||b. 19/20 | | ||c. 1/20 | | ||d. 0 | | Correct Marks for this distribution: 1/1. Query 8 Markings: 1 Precisely what is the level of relevance? Choose one answer. ||a. Beta error | | ||b. Probability of a Type 2 error | | ||c. Probability of the Type We error | | ||d. z-value of 1. 6 | | Appropriate Marks for this submission: 1/1. Question on the lookout for Marks: one particular What is the critical benefit for a one-tailed hypothesis test in which a null hypothesis is definitely tested on the 5% degree of significance based on a sample scale 25? Choose one answer. ||a. 1 . 711 | | ||b. installment payments on your 064 | | ||c. 1 . 708 | | ||d. 2 . 06 | | df = 25-1=24 a sama dengan 0. 05 one-tailed test, the corresponding value of t is 1 ) 711 Correct Marks with this submission: 1/1. Question 12 Marks: you In hypothesis testing, what is the level of significance?

Choose one response. ||a. Value between 0 and you | | ||b. Likelihood of rejecting the null hypothesis when it is authentic | | ||c. Represented by the Traditional letter a | | ||d. All of the others will be true | | ||e. Selected prior to a decision regulation can be formulated | | Incorrect Marks for this submission: 0/1. Issue 11 Signifies: 1

For any one-tailed hypothesis test, the critical z-value of the check statistic is definitely -2. thirty-three. Which from the following is true about the hypothesis test out? Choose one solution. ||a. a = 0. 01 for an upper-tailed test | | ||b. a = 0. 01 for a lower-tailed test | | ||c. a = 0. 05 for a lower-tailed test | | ||d. a sama dengan 0. 05 for a great upper-tailed test | | The absolute value of -2. 33 gives an area under the normal curve of 0. 4901. Their one-tailed evaluation, thus a = zero. 5 0. 4901 sama dengan 0. 0099 = zero. 01.

The critical z-value is -2. 33, as a result in the lower or still left tail. Right Marks with this submission: 1/1. Question 12 Marks: one particular What are both critical values for a two-tailed test with a 0. 01 level of relevance when n is significant and the human population standard deviation is known? Select one answer. ||a. Above 2 . 58 and below -2. 58 | | ||b. Above 1 . 00 and below -1. 00 | | ||c. Above 1 ) 96 and below -1. 96 | | ||d. Above 1 . 65 and below -1. 65 | | In the event population standard deviation is well know, we employ Z check.

Two-tailed test out with a=0. 01 sama dengan, areas beneath the normal contour = (1-0. 01)/2 sama dengan 0. 495 =, z critical benefit = 2 . 58. The rejection location is for calculated z, 2 . 58 or z, -2. 58 Correct Marks just for this submission: 1/1. Question 13 Marks: you For a speculation test with an alternative hypothesis: , 6th, 700, where is the rejection region for the speculation test located? Choose one response. ||a. Upper or proper tail | | ||b. Center | | ||c. Lower or left tail | | ||d. Equally tails | | The null speculation is

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