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The mean return for a random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Make a 95 percent confidence interval for the population mean.
assume you want to test the claim the paired sample data given below come from a population for which the mean difference is mean d = 0.
Find out the standard error of the sample mean.
A population has the mean of 180 and the standard deviation of 24. A sample of 64 observations will be taken. The probability that the sample mean will be between the 183 and 186 is
If random samples, each with n = 25 scores, are selected from a normal population with u, = 80 and a = 20, and the mean is calculated for each sample, then an average distance between M and u would
An automotive repair shop has determined that average service time on the automobile is 2 hours with the standard deviation of 32 minutes. A random sample of 64 services is chosen.
If random samples, each with n = 4 scores, are selected from a normal population with MK = 80 and o=10, then the distribution of sample means would have a standard error of __________ .
When a random sample is selected from a population, the sample mean is not expected to be exactly equal to the population mean.
The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified with the objective of making it last long
Compute the value of z and state your decision regarding the null hypothesis.
An insurance industry report indicated that 40 percent of those persons involved in minor traffic accidents this year have been involved in at least one other traffic accident in last 5 years.
Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years.
Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed mean age to be 9.2 years. The standa
Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The st
The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50. (This indicates that the stock of asprin turns over o
The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50.
A registrar wants to estimate the arithmetic mean grade point average (GPA) of all graduating seniors during the past 10 years. GPA range between 2 and 4. The mean GPA is to be estimated within plus
A study of church contributions revealed that 15 of 40 families sampled attend church regularly. Make the 95 percent confidence interval for the proportion of families attending church regularly. Sh
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on shape and colour of the container. Of the 1, 4000 homemakers sampled,
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and colour of the container. Of the 1, 4000 homemakers samp
Is it reasonable to conclude that the typical worker does not miss any days during a pay period.
describes why the t distribution is used as a part of the confidence interval.Is it reasonable to end that the typical worker does not miss any days during a pay period.
A lady sells homemade bread at 50 locations in town. She is concerned about absenteeism with the workers. Below is the number of days for a sample of 10 workers for the last 2 week pay period.