Find the pooled standard deviation for problem

Reference no: EM13121212

A two-sample t test is going to be carried out where it is assumed that the population variances are unknown but assumed equal. The first sample of 30 items were chosen and measured. For this first sample, an average response of 125 with a sample variance of 25 was found. The second sample of 40 items were chosen and measured. This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem? (rounded to second place after the decimal).

Reference no: EM13121212

Questions Cloud

Total manufacturing cost per unit : The following department data are available: Total materials costs $180,000 Equivalent units of materials 60,000 Total conversion costs $105,000 Equivalent units of conversion costs 30,000 What is the total manufacturing cost per unit?

Find the probability of passing photography : Probability: Mary is taking two courses, photography and economics. Student records indicate that the probability of passing photography is 0.75, that of failing economics is 0.65, and that of passing at least on of the two courses is 0.85.

Development of manufacturing : Explain carefully the steps in his analysis. Then discuss how his reasoning might or might not apply to today's debates over globalization, barriers to free trade, profitability, and productivity gains.

Find the limiting reactant,mass of n2 : Two compounds of nitrogen tetroxide(N2O4) and hydrazine(N2H4) are used as rocket fuels.When the two are mixed,they ignite and produce nitrogen gas and water.

Find the pooled standard deviation for problem : This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem?

Equivalent units for conversion costs : Equivalent units for materials total 20,000. There were 16,000 units completed and transferred out. Equivalent units for conversion costs equals 18,000. How much are the physical units for conversion costs if ending work in process is 50% complete..

Find the adults board first and randomly select seats : The adults board first and randomly select seats. The children select seats in order with c1 selecting first, c2 selecting second

Determining fields and ideals : Let F be a field and f(x), g(x) be elements of F[x]. Show that f(x) divides g(x) if and only if g(x) is an element of .

What is the emperical formular of the compound : A cumbustion analysis was carried out on 1.621g of newly synthesize compound which was known to contain only carbon,hydrogen and oxygen.

User Account

All Pages