2. A survey of 400 teachers was undertaken. Each teacher was asked how much time was...
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A survey of 400 teachers was undertaken. Each teacher was asked how
much time was...
Statistic for management and economics (Estimation)
A survey of 400 statistics professors was undertaken. Each professor was asked how much time was devoted to teaching graphical techniques. We believe that the times are normally distributed with a standard deviation of 30 minutes. Estimate the population mean with 95% confidence.
In a survey, 25 people were asked how much they spent on their child's last birthday...
In a survey, 25 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $49 and standard deviation of $11. Estimate how much a typical parent would spend on their child's birthday gift (use a 98% confidence level). Give your answers to one decimal place. Provide the point estimate and margin or error.
In a survey, 22 people were asked how much they spent on their child's last birthday...
In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $12. Estimate how much a typical parent would spend on their child's birthday gift (use a 98% confidence level). Give your answers to one decimal place. Provide the point estimate and margin or error. ±± Do you add ( ) when answering?
In a survey, 11 people were asked how much they spent on their child's last birthday...
In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39 and standard deviation of $18. Construct a confidence interval at a 98% confidence level.
In a survey, 24 people were asked how much they spent on their child's last birthday...
In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43.6 and standard deviation of $11.1. Estimate how much a typical parent would spend on their child's birthday gift (use a 98% confidence level). Give your answers to 3 decimal places. Express your answer in the format of x bar ± E. $ ___ ± $ ___
all answers please 3. The teachers union is concerned about the amount of time teachers spend...
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
In a survey, 30 people were asked how much they spent on their child's last birthday...
In a survey, 30 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37 and standard deviation of $13. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place.
In a survey 10 people were asked how much they spent on their child's last birthday...
In a survey 10 people were asked how much they spent on their child's last birthday gift. The results were roughly bell shaped with a mean of $34 and a standard deviation of $12. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place _________ +/- ___________
In a survey, 27 people were asked how much they spent on their child's last birthday...
In a survey, 27 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $12. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place.
In a survey, 22 people were asked how much they spent on their child's last birthday...
In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $2. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place. ±
all answers please
3. The teachers union is concerned about the amount of time teachers spend each week doing schoolwork at home. A simple random sample of 56 teachers had a mean of 8.0 hours per week working at home after school. Assume that the population standard deviation is 1.5 hours per week. a) Construct a 95% confidence interval estimate for the mean number of hours per week a teacher spends working at home. b) Does the confidence interval support...
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