Kroger indicates the average salary per hour of their employees is $9 per hour. A sample of 13 Kroger employees revealed a mean of $11 per hour with a standard deviation of $3 per hour. Costco indicates the average salary per hour of their employees is $10 per hour. A sample of 15 Costco employees revealed a mean of $9.50 per hour with a standard deviation of $2 per hour. At the .05 significance level, can we conclude there is a mean difference between the Kroger employees’ salary per hour and the Costco employees’ salary per hour?
A.State the null hypothesis:
B.State the alternative or research hypothesis:
C.Select the level of significance:
D.Select the test statistic and rationale:
E.Formulate the decision rule:
F. Make a decision and interpret the results:
Kroger indicates the average salary per hour of their employees is $9 per hour. A sample...
29 Snake Pliskin, the owner of NYC Rodent Infestation Solutions, Corp. recently observed a difference between it's male and female sales agents. A sample of 40 days reveals Men sold a mean of $1,400.00 worth of new accounts per day. A sample of 50 days revealed that women sold a mean of $1,500.00 worth of new accounts per day. Assume the population standard deviation for men is $200.00 and for women is $250.00. At the .05 significance level, can Mr....
5. Suppose researchers have reported that the population mean for the annual salary of certified welders was $40,000, and the population standard deviation was $5200. A new survey of 200 welders was taken, and the mean annual salary of this sample was $39,000. At the 0.05 significance level, can we conclude that the mean annual salary of certified welders is less than $40,000? Complete steps 1 through 6 below. STEP 1. State the null hypothesis and the alternate hypothesis. (worth...
Billy wants to test whether the average speed of his favorite pitcher’s fastball differs from the league average of 92 miles per hour. He takes a sample of 36 of the pitcher’s fastballs and computes a sample mean of 94 miles per hour. Assume that the standard deviation of the population is 4 miles per hour.a. Specify the null and alternative hypotheses to test Billy’s claim.b. Calculate the value of the test statistic and the p-value.c. At the 5% significance level,...
A recent national survey found that high school students watched an average (mean) of 7.0 DVDs per month with a population standard deviation of 0.60 hour. The distribution of DVDs watched per month follows the normal distribution. A random sample of 43 college students revealed that the mean number of DVDs watched last month was 6.50. At the 0.05 significance level, can we conclude that college students watch fewer DVDs a month than high school students? a. State the null...
The director of a stage agency believes that the average starting salary for clerical employees in the state is less than $30,000 per year, to test her hypothesis; she has collected a simple random sample of 100 starting clerical salaries from across the state and found that the sample mean is $ 29,750. State the appropriate null and alternative hypotheses. Assuming the population standard deviation is known to be $2,500 and the significance level for the test is to be...
A recent national survey found that high school students watched an average (mean) of 7.1 DVDs per month with a population standard deviation of 1.00. A random sample of 33 college students revealed that the mean number of DVDs watched last month was 6.20. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students? 1.) State the decision rule. a.) Reject H0 if z > -1.65 b.) Reject H1 if...
The mean income per person in the United States is $39,500, and the distribution of incomes follows a normal distribution. A random sample of 16 residents of Wilmington, Delaware, had a mean of $45,500 with a standard deviation of $9,800. At the 0.010 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average? A.) State the null hypothesis and the alternate hypothesis. B.)State the decision rule for 0.010 significance...
According to the information obtained from a large university, professors there earned an average annual salary of $55,648 in 1998. A recent random sample of 15 professors from this university showed that they earn an average annual salary of $58,800 with a sample standard deviation of $8300. Assume that the annual salaries of all the professors in this university are normally distributed. (a) Suppose the probability of making a type I error is chosen to be zero. Without performing all...
storms four miles per hd 1% confid 1. The mean salary of federal government employees on the General Schedule is $59, 593. The average salary of 30 state employees who do similar work is $58, 800 with a population standard deviation o = $1500. At a = 0.01 level of significance, can it be concluded that state employees earn on average less than federal employees? rror (E)- er of cl I have 12 ch. .1 chy
The mean income per person in the United States is $35,500, and the distribution of incomes follows a normal distribution. A random sample of 8 residents of Wilmington, Delaware, had a mean of $39,500 with a standard deviation of $8,200. At the 0.010 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average? State the null hypothesis and the alternate hypothesis. State the decision rule for 0.010 significance level....