A New Light Bulb Is Being Considered for Use in an Office

question 48

Essay

A new light bulb is being considered for use in an office It is decided that the new bulb will be used only if it has a mean lifetime of more than 500 hours. A random sample of 40 bulbs is selected and placed on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Perform the appropriate test of hypothesis to determine whether the new bulb should be used. Use a 0.01 level of significance.

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Definitions:

Two-way Table

A statistical table that displays data for two variables, showing the relationship or interaction between these variables in a matrix format.

Grand Total

The sum of all numbers or quantities in a series, often the final total in a table of numbers.

Column Portions

Segments or parts of a column in a table or spreadsheet, often referred to in data analysis.

Two-way Table

A tabular method to represent data that can help in analyzing the relationship between two categorical variables.