1. A company had its sales persons undergo training, hoping to improve their sales.Past sales data indicate that the average sale was P4,000 per transaction on anormally distributed population. After training, sales data, taken from a randomsample of 25 salesmen/salesladies, indicates an average sale of P4,500 with astandard deviation of P150. (a) Write the null hypothesis. (b) Write the alternativehypothesis. (c) Formulate and calculate the test-statistic. Is it a one-tail or two-tailed test? Did the training work at 95% confidence level? (d) Determine theconfidence interval.

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Asked Mar 25, 2020
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1. A company had its sales persons undergo training, hoping to improve their sales.
Past sales data indicate that the average sale was P4,000 per transaction on a
normally distributed population. After training, sales data, taken from a random
sample of 25 salesmen/salesladies, indicates an average sale of P4,500 with a
standard deviation of P150. (a) Write the null hypothesis. (b) Write the alternative
hypothesis. (c) Formulate and calculate the test-statistic. Is it a one-tail or two-
tailed test? Did the training work at 95% confidence level? (d) Determine the
confidence interval.
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1. A company had its sales persons undergo training, hoping to improve their sales. Past sales data indicate that the average sale was P4,000 per transaction on a normally distributed population. After training, sales data, taken from a random sample of 25 salesmen/salesladies, indicates an average sale of P4,500 with a standard deviation of P150. (a) Write the null hypothesis. (b) Write the alternative hypothesis. (c) Formulate and calculate the test-statistic. Is it a one-tail or two- tailed test? Did the training work at 95% confidence level? (d) Determine the confidence interval.

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According to the given question, a company had it sales persons undergo training, hoping to improve their sales. Past sales data indicate that the average sale was P 4,000 per transaction on a normally distributed population. After training, sales data, taken from a random sample of 25 salesmen/salesladies, indicates an average sale of P 4,500 with a random standard deviation of P 150.

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