Construct the Indicated Confidence Interval for the Difference Between the Two

question 119

Multiple Choice

Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal.
-A paint manufacturer wished to compare the drying times of two different types of paint. Independent simple random samples of 11 cans of type $A$ and 9 cans of type B were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows.

$\begin{array}{l|l}\text { Type A } & \text { Type } \mathrm{B} \\\hline \overline{\mathrm{x}}_{1}=75.7 \mathrm{hrs} & \overline{\mathrm{x}}_{2}=64.0 \mathrm{hrs} \\\mathrm{s}_{1}=4.5 \mathrm{hrs} & \mathrm{s}_{2}=5.1 \mathrm{hrs} \\\mathrm{n}_{1}=11 & \mathrm{n}_{2}=9\end{array}$
Construct a $98 \%$ confidence interval for $\mu _ { 1 } - \mu _ { 2 }$ , the difference between the mean drying time for paint of type $A$ and the mean drying time for paint of type $B$ .

• A) \(6.38\) hrs \(< \mu _ { 1 } - \mu _ { 2 } < 17.02\) hrs
• B) \(6.08 \mathrm { hrs } < \mu _ { 1 } - \mu _ { 2 } < 17.32 \mathrm { hrs }\)
• C) \(6.15\) hrs \(< \mu _ { 1 } - \mu _ { 2 } < 17.25 \mathrm { hrs }\)
• D) \(6.22 \mathrm { hrs } < \mu _ { 1 } - \mu _ { 2 } < 17.18 \mathrm { hrs }\)

Comprehend sales revenue recognition and the impact of collecting sales taxes on financial reporting.

Recognize the accounting treatment for subscriptions and the revenue recognition principle.

Understand the categorization and implications of employer payroll taxes and liabilities.

Ability to identify and prepare necessary adjusting entries for accrual accounting purposes.

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The central ridge or projection on the sternum (breastbone) that resembles the keel of a boat, more prominent in some animals like birds for attachment of flight muscles.

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