A machine fills cereal boxes. Each box is to contain 525 grams. The machine is considered to be working properly if in a production run the machine fill value is 525 grams. To check it the machine is working properly each day, a sample of the boxes (size n=12 boxes) of that day's production is selected. The way the machine works is that it is very unlikely to under fill by much, so the main concern is that the machine fill level does not increase. A little extra of the product in each box adds up to a big loss for the company. A sample of one production run gave the following data:
520, 525, 523, 524, 525, 524, 528, 523, 522, 524, 525, 530
Using the above data calculate the p-value for the null hypothesis that the median fill is still at 525g versus the alternative that it has increased. Give your answer to 3 decimal places.
As the p-value is very high; we fail to reject the null huhypothes and conclude that the median fill is still at 525g.
A machine fills cereal boxes. Each box is to contain 525 grams. The machine is considered to be w...
A machine fills boxes of cereal in a factory. The average weight of cereal in a random sample of 17 boxes is calculated to be 350 grams and the sample standard deviation is calculated to be 8 grams. Weights of cereal per box are known to follow a normal distribution. We calculate a 90% confidence interval for the true mean weight of cereal per box. The margin of error for the appropriate confidence interval is:
26. A machine fills boxes of cereal in a factory. The average weight of cereal in a randonm sample of 17 boxes is calculated to be 1350 grams and the sample standard deviation is calculated to be 8 grams. Weights of cereal per box are known to follow a normal distribution. We calculate a 95% donfidence interval for the true mean weight ot cereal per box. The margin of error for the appropriate confidence interval i (A) 3.19 (B) 3.38...
A cereal manufacturer has a machine that fills the boxes. Boxes are labeled “16 ounces”, so the company wants to have that much cereal in each box, but since no packaging process is perfect, there will be minor variations. If the machine is set at exactly 16 ounces and the Normal model applies, then about ½ the boxes will be underweight, making consumers unhappy and exposing the company to bad publicity and possible lawsuits. To prevent underweight boxes, the manufacturer...
A machine that is programmed to package 1.90 pounds of cereal in each cereal box is being tested for its accuracy. In a sample of 26 cereal boxes, the mean and the standard deviation are calculated as 2.02 pounds and 0.24 pound, respectively. (You may find it useful to reference the appropriate table: z table or table) a. Select the null and the alternative hypotheses to determine if the machine is working improperly, that is, it is either underfilling or...
A machine that is programmed to package 2.95 pounds of cereal in each cereal box is being tested for its accuracy. In a sample of 33 cereal boxes, the mean and the standard deviation are calculated as 2.97 pounds and 0.06 pound, respectively. (You may find it useful to reference the appropriate table: z table or table) a. Select the null and the alternative hypotheses to determine if the machine is working improperly, that is, it is either underfilling or...