A custodian wishes to compare two competing floor waxes to decide which one is best. He believes that the mean of WaxWin is less than the mean of WaxCo. In a random sample of 60 floors of WaxWin and 33 of WaxCo. WaxWin had a mean lifetime of 20.5 and WaxCo had a mean lifetime of 20.6. The population standard deviation for WaxWin is assumed to be 10.3 and the population standard deviation for WaxCo is assumed to be 8.4. Perform a hypothesis test using a significance level of 0.10 to help him decide. Let WaxWin be sample 1 and WaxCo be sample 2. The correct hypotheses are: Ο Ηο: μι < με HA: M1 M₂(claim) Ο Ηο: με 2 με HA1₂(claim) O Ho: ₁ = 2 HA: M12(claim) Since the level of significance is 0.10 the critical value is -1.282 (round to 3 places) The test statistic is: The p-value is: (round to 3 places)

12) If the standard deviation of a data set is (17.2); the variance will be (295.84).   Select one: True False

Birth weights in the US are normally distributed with a mean of 3420 g and a Standard deviation of 495 g. If a hopsital plans to set up special observation conditions for the lightest 3% of babies, what weight is used for the cut-off separating the lightest 3% from others?

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 3000 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3400 grams and a standard deviation of 560 grams. If a 35-week gestation period baby weighs 2600 grams and a 41-week gestation period baby weighs 3000 grams, find the corresponding z-scores. Which baby weighs less relative to the gestation period? Find the corresponding z-scores. Which baby weighs relatively less? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. The baby born in week 41 weighs relatively less since its z-score, is larger than the z-score of for the baby born in week 35. O B. The baby born in week 41 weighs relatively less since its z-score, , is smaller than the z-score of for the baby born in week 35. O C. The baby born in week 35 weighs relatively less since its z-score, , is…

The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players’ salaries and 35 football players’ salaries is selected. The mean salary is determined for both samples. Let  represent the difference in the mean salaries for baseball and football players. Which of the following represents the standard deviation of the sampling distribution for ? A) 0.41 million B) 0.57 million C) 2.5 million D) 3.5 million

A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2 ounces. You subsequently discover that the scale used to measure all patients overestimates the weight by 3 pounds. What is the true mean of the sample weights (in pounds)? And if, A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2 ounces. You subsequently discover that the scale used to measure all patients underestimate the weight by 3 pounds. What is the true standard deviation (in ounces) of the sample weights?

A certain type of battery supercharger was found to take a mean of 12.3 minutes to charge a standard electric vehicle (EV) battery. A firmware update for this type of supercharger was recently released, but the update has received negative reviews from users. A researcher suspects the mean time the updated superchargers take to charge a standard EV battery is greater than 12.3 minutes. To test his claim, he chooses 21 of the updated superchargers at random and measures the time it takes each one to charge a standard EV battery. He finds that the superchargers take a sample mean of 12.9 minutes to charge a standard EV battery, with a sample standard deviation of 1.3 minutes. Assume that the population of amounts of time to charge a standard EV battery using the updated superchargers is approximately normally distributed. Complete the parts below to perform a hypothesis test to see if there is enough evidence, at the 0.05 level of significance, to support the claim that u, the mean time…

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2700 grams and a standard deviation of 600 grams while babies born after a gestation period of 40 weeks have a mean weight of 3000 grams and a standard deviation of 470. If a 32​-week gestation period baby weighs 2200 grams and a 40​-week gestation period baby weighs 2500 grams, find the corresponding​ z-scores. Which baby weighs less relative to the gestation​ period? Find the corresponding​ z-scores. Which baby weighs relatively less​? Select the correct choice below and fill in the answer boxes to complete your choice. ​(Round to two decimal places as​ needed.)   A. The baby born in week 32 weighs relatively less since its​ z-score, _____, is larger than the​ z-score of ______ for the baby born in week 40.   B. The baby born in week 40 weighs relatively less since its​ z-score, ______, is smaller than the​ z-score of negative ________ for the baby born in week 32.   C. The baby born in week…

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 3000 grams and a standard deviation of 600 grams while babies born after a gestational period of 40 weeks have a mean weight of 3300 grams and a standard deviation of 435 grams. If a 34-week gestation period baby weighs 3175 grams and a 40-week gestation period baby weighs 3475 grams, find the corresponding z-scores. Which baby weighs more relative to the gestation period?

The number of peas in a pod varies from farm to farm. In a random sample of 50 pods from farm A, there was a mean of 4.2 peas per pod with a standard deviation of 1.03 peas per pod. In a random sample of 50 pods from farm B, there was a mean of 5.1 peas per pod with a standard deviation of 1.92 peas per pod. Agricultural researchers want to find evidence whether the pods from farm B have more peas per pod on average. What is the appropriate hypothesis test? a paired t-test for a mean difference a one-sample z-test for a population mean a two-sample t-test for a difference in means a one-sample z-test for a population proportion a two-sample z-test for a difference in proportions