State with brief reason whether the following statements are true, false, or uncertain:a. In the presence of heteroscedasticity OLS estimators are biased as well as inefficient. b. If heteroscedasticity is present, the conventional t and F tests are invalid. c. In the presence of heteroscedasticity the usual OLS method always overestimates the standard errors of estimators. d. If residuals estimated from an OLS regression exhibit a systematic pattern, it means heteroscedasticity is present in the data. e. There is no general test of heteroscedasticity that is free of any assumption about which variable the error term is correlated with. f. If a regression model is mis-specified (e. g., an important variable is omitted), the OLS residuals will show a distinct pattern. g. If a regressor that has nonconstant variance is (incorrectly) omitted from a model, the (OLS) residuals will be heteroscedastic.

The beach dude (bd) employs a legion of current and former surfers as salespeople who push its surfing-oriented products to various customers (usually retail outlets). this case describes bd's sales and collection process. each bd salesperson works with a specific group of customers throughout the year. in fact, they often surf with their customers to try out the latest surf gear. the bd salespeople act laid-back, but they work hard for their sales. each sale often involves hours of surfing with their customers while the customers sample all the latest surf wear. because bd makes the best surfing products, the customers look forward to the visits from the bd salespeople. and they often buy a lot of gear. each sale is identified by a unique invoice number and usually involves many different products. customers pay for each sale in full within 30 days, but they can combine payments for multiple sales. bd manages its clothing inventory by item (e.g., xl bd surfer logo t-shirts), identified by product number, but it also classifies the items by clothing line (the lines are differentiated by price points as well as the intended use of the clothing, e.g., surfing products, casual wear, . draw a uml class diagram that describes the beach dudes sales and collection process.b. using microsoft access, implement a relational database from your uml class diagram. identify at least three fields per table.c. describe how you would use the relational database to determine the beach dude’s accounts receivable.

Match each item to check for while reconciling a bank account with the document to which it relates.(there's not just one answer)1. balancing account statement2. balancing check registera. nsf feesb. deposits in transitc. interest earnedd. bank errors

Karen is working on classifying all her company’s products in terms of whether they have strong or weak market share and whether this share is in a slow or growing market. what type of strategic framework is she using?